Java Programs

LIST OF JAVA PROGRAMS:S.No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

Programs Program to Demonstrate simple JAVA program Program to compute the area of a circle Program to demonstrate type casting in JAVA Program to demonstrate the basic Arithmetic Operations Program to find largest of three numbers Program to print first 10 Fibonacci numbers Program to Calculate the factorial of a number using RECURSION Program to print prime numbers using CLA Program to Demonstrate Command Line Argument Program to convert temperature from Fahrenheit to Celsius using CLA Program to produce conversion table dollar and rupees using CLA Program to print area of right angled triangle using CLA Program to print all the elements in an array using CLA Program to find the sum of all the elements in an array Program to print all the elements in a 2D array Program to find the sum of two matrices Program to find the difference of two matrices using CLA Program to print the UPPER and LOWER triangle of a matrix Program to find the trace of a matrix Program to find the transpose of a matrix Program to find the product of two matrices Program to demonstrate a CLASS Program to demonstrate a Constructor Program to demonstrate a Parameterized Constructor Program to Demonstrate THIS keyword Program to Demonstrate Constructor Overloading Program to pass objects as parameters Program to Demonstrate Queue using Class Program to Demonstrate Stack using Class Program to Demonstrate Access Specifiers Program to Demonstrate Static Variables Program to Demonstrate Static Methods Program to demonstrate an Inner class Program to Demonstrate Type Wrapping Program to Demonstrate Single Inheritance Program to Demonstrate Multilevel Inheritance Program to Demonstrate hierarchical Inheritance Program to show SUPER Class variable to refer a sub class object Program to Demonstrate Method Overriding Program to Demonstrate Runtime Polymorphism Program to Demonstrate Abstract Class

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Program to Demonstrate FINAL Keyword Program to Demonstrate FINAL Method Program to Demonstrate FINAL Class Program to Demonstrate INTERFACE Program to access implementation through Interface references Program to Demonstrate EXTENDING INTERFACE Program to Demonstrate Stack using interface Program to Demonstrate Queue using Interface Program to Demonstrate a SIMPLE PACKAGE Program to Demonstrate Exception Program to Demonstrate TRY CATCH Program to Demonstrate CATCH ARITHMETIC Exceptions Program to Demonstrate Multiple CATCH Program to Demonstrate NESTED TRY Program to Demonstrate FINALLY clause Program to Demonstrate User Defined EXCEPTIONS Program to Demonstrate Throws Program to Demonstrate MULTITHREADING Program to Demonstrate Runnable Interface Program to Demonstrate Thread Priorities Program to Demonstrate Synchronized Block Program to Demonstrate Synchronized Method Program to Demonstrate Deadlock Program to Demonstrate Thread Methods Program to Create Threads using Thread Class Program to Demonstrate Join() & isAlive() methods Program to Show how to Get User Input from Keyboard Program to Create a Frame Window using Applet Program to Demonstrate Life cycle of methods in Applet Program to display Parameters Passed from HTML Program to Demonstrate all shapes in Graphics class Program to Show a Hut,Mountains & Face Program to Show Status of Applet Window Program to Show Position of the Mouse Program to Demonstrate Colors Program to Pass Parameters perform Mathematical Operations Program To Get Document Code Bases Program to Show an Image

Program to demonstrate an Adapter Program to Demonstrate Simple Banner Program to Demonstrate Button Program to Demonstrate Checkbox Program to Demonstrate Radio Buttons (Checkbox Group) Program to Demonstrate Choice

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Program to Demonstrate File Dialog Program to Demonstrate Labels Program to Demonstrate Lists Program to Demonstrate Menu Program to Demonstrate Text Area Program to Make a Login Window Program to Make a Login Focus Program to Demonstrate Mouse Adapter Program to Demonstrate Mouse Events Program to Demonstrate the key event handlers Program to Demonstrate Border Layout Program to Demonstrate Card Layout

Program to Test Fonts Using Mouse Events Program to Demonstrate Grid Layout Program to Demonstrate Scrollbar

Program to Check Connection to Database Program to retrieve Records from Database Program to demonstrate Insertion into Database Program to demonstrate Update into Database Program to demonstrate Prepared Statement Program to Demonstrate Data Entry using Applet Program to Demonstrate Result Set Meta Data Program to Demonstrate Transaction handling Program to Demonstrate Callable Statement Program to Demonstrate Result Set Meta Data Program to Demonstrate Database Meta Data Program to add Interface Program to add Server Program to add Client Program for implementation for the interface Create a Policy to Allow Permission for Everyone

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01 Program to Demonstrate simple JAVA program class A { public static void main(String args[]) { System.out.println("Welcome to my World"); } } ----------------------------------------------------------------------------------------Save the above Program as A.java Compile Program in Command by using javac C:\>javac A.java Run the Program in Command by using java C:\>java A --------------------------------------------------------------------------------------------OUTPUT : Welcome to my World

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02 Program to compute the area of a circle class A2 { public static void main(String args[]) { int r=10; System.out.println("Radius of Circle :" + r); System.out.println("Area of Circle :" + r*r); } } OUTPUT : Radius of Circle : 10 Area of Circle : 314

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03 Program to demonstrate type casting in JAVA class conversion { public static void main(String args[]) { byte b; int i=257; double d=323.142; System.out.println("\nConversion of int to byte."); b=(byte) i; System.out.println("i and b " +i+" "+b); System.out.println("\nConversion of double to int."); i=(int)d; System.out.println("d and i " +d +" "+i); System.out.println("\nConversion of double to byte."); b=(byte)d; System.out.println("d and b " +d + " " +b); } } OUTPUT : Conversion of int to byte. i and b 257 1 Conversion of double to int. d and i 323.142 323 Conversion of double to byte. d and b 323.142 67

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04 Program to demonstrate the basic Arithmetic Operations class arith { public static void main(String args[]) { int a=10,b=3; System.out.println("sum is "+(a+b)); System.out.println("difference is "+(a-b)); System.out.println("product is "+(a*b)); System.out.println("quotient is "+(a/b)); System.out.println("remainder is "+(a%b)); } } OUTPUT : sum is 13 difference is 7 product is 30 quotient is 3 remainder is 1

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05 Program to find largest of three numbers class large { public static void main(String args[]) { int a=10,b=30,c=20; System.out.println("Greatest of given 3 numbers"); if(a>b&&a>c) System.out.println(+a); else if(b>c) System.out.println(+b); else System.out.println(+c); } } OUTPUT : Greatest of given 3 numbers 30

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06 Program to print first 10 Fibonacci numbers class fib { public static void main(String args[]) { int i=9,f=0,s=1,temp; System.out.println(+f); while(i>0) { System.out.println(+s); temp=f+s; f=s; s=temp; i--; } } } OUTPUT : 0 1 1 2 3 5 8 13 21 34

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07 Program to Calculate the factorial of a number using RECURSION class Factorial { int fact(int n) { int result; if(n==1) return 1; result=fact(n-1)*n; return result; } } class Recursion { public static void main(String args[]){ Factorial f=new Factorial(); System.out.println("Factorial of 3 is " +f.fact(3)); System.out.println("Factorial of 4 is " +f.fact(4)); System.out.println("Factorial of 5 is " +f.fact(5)); } } OUTPUT : Factorial of 3 is 6 Factorial of 4 is 24 Factorial of 5 is 120

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08 Program to print prime numbers using CLA class primecla { public static void main(String s[]) { int n,r; n=Integer.parseInt(s[0]); for(int i=2;i<=n;i++) { int c=0; for(int j=1;j<=i;j++) { r=i%j; if (r==0) c+=1; } if(c==2) System.out.println(i); }}} OUTPUT : java primecla 10 2 3 5 7

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09 Program to Demonstrate Command Line Argument class CommandLine { public static void main(String args[]) { for(int i=0; i<args.length; i++) System.out.println("args[" +i + "]: "+args[i]); } } OUTPUT : java CommandLine 1 3 4 2 5 args[0]: 1 args[1]: 3 args[2]: 4 args[3]: 2 args[4]: 5

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10 Program to convert temperature from Fahrenheit to Celsius scale using CLA class ftoccla { public static void main(String s[]) { int f; double c; f=Integer.parseInt(s[0]); c=5*(f-32)/9; System.out.println(f+" fahrenheit = "+c+" celsius"); } } OUTPUT : java ftoccla 34 34 fahrenheit = 1.0 celsius

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11 Program to produce the conversion table for dollar and rupees using CLA class dollarcla { public static void main(String s[]) { int n,d; n=Integer.parseInt(s[0]); System.out.println("Dollars\t\tRupees" ); for(int i=1;i<=n;i++) { d=Integer.parseInt(s[i]); System.out.println(d+"\t=\t"+(d*45) ); } } } OUTPUT : java dollarcla 4 1 34 36 37 Dollars Rupees 1 = 45 34 = 1530 36 = 1620 37 = 1665

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12 Program to print area of right angled triangle using CLA class AreaTri { public static void main(String s[]) { int a,b,area; a=Integer.parseInt(s[0]); b=Integer.parseInt(s[1]); area=a*b/2; System.out.println("Area of Right angled Triangle = "+area); } } OUTPUT : java AreaTri 5 4 Area of Right angled Triangle = 10

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13 Program to print all the elements in an array using CLA class matrixcla { public static void main(String s[]) { int n,m; n=Integer.parseInt(s[0]); System.out.println("The length of the matrix is: " +n); System.out.println("The elements of the matrix are:"); for(int i=1;i<=n;i++) { m=Integer.parseInt(s[i]); System.out.println(m); } } } OUTPUT : java matrixcla 5 10 34 36 37 99 The length of the matrix is: 5 The elements of the matrix are: 10 34 36 37 99

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14 Program to find the sum of all the elements in an array class Sum { public static void main(String args[]) { double nums[]={1.1,1.2,1.3,1.4,1.5}; double result=0; System.out.println("The Elements of Array are :"); for(int i=0;i<5;i++) { System.out.println(nums[i]); result=result+nums[i]; } System.out.println("Sum is " + result); } } OUTPUT : The Elements of Array are : 1.1 1.2 1.3 1.4 1.5 Sum is 6.5

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15 Program to print all the elements in a 2D array class Matrix { public static void main(String s[]) { int a[][]= {{1,2,3},{4,5,6}}; System.out.println("Number of Row= " + a.length); System.out.println("Number of Column= " + a[1].length); System.out.println("The elements of the matrix are : "); for(int i = 0; i
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16 Program to find the sum of two matrices class addm { public static void main(String args[]) { int a[][]={{1,2,3},{4,5,6},{7,8,9}}; int b[][]={{1,1,1},{0,1,0},{0,0,1}}; int c[][]= new int[3][3]; int i,j; for(i=0;i<3;i++) for( j=0;j<3;j++) c[i][j]=a[i][j]+b[i][j]; for(i=0;i<3;i++) { for(j=0;j<3;j++) System.out.print(+c[i][j]+ " "); System.out.println(); } } } OUTPUT : 2 3 4 4 6 6 7 8 10

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17 Program to find the difference of two matrices using CLA class Matrixcla { public static void main(String s[]) { int a[][]=new int[2][2]; int b[][]=new int[2][2]; int x,y,k=0; System.out.println("First Matrix : "); for(int i = 0; i < 2; i++) { for(int j = 0; j < 2; j++) { x=Integer.parseInt(s[k]); a[i][j]=x; k++; System.out.print(" "+ a[i][j]); } System.out.println(); } System.out.println("Second Matrix : "); for(int i = 0; i <2; i++) { for(int j = 0; j <2; j++) { y=Integer.parseInt(s[k]); b[i][j]=y; k++; System.out.print(" "+b[i][j]); } System.out.println(); } System.out.println("Difference of two matrix : "); for(int i = 0; i <2; i++) { for(int j = 0; j <2; j++) System.out.print(" "+(a[i][j]-b[i][j])); System.out.println(); }}} OUTPUT : java Matrixcla 6 7 8 9 5 5 5 5 First Matrix : 67 89 Second Matrix : 55 55 Difference of two matrix : 12 34

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18 Program to print the UPPER and LOWER triangle of a matrix class UppLow{ public static void main(String arsg[]) { int a[][]={{1,2,3},{4,5,6},{7,8,9}}; System.out.println("the given matrix:"); for(int i=0;i<3;i++) { for(int j=0;j<3;j++) System.out.print(" "+a[i][j]); System.out.println(); } System.out.println("upper triangle of matrix:"); for(int i=0;i<3;i++) { for(int j=0;j<3;j++) { if(i<=j) System.out.print(a[i][j] + " "); else System.out.print(" "); } System.out.println(); } System.out.println("lower triangle of matrix:"); for(int i=0;i<3;i++) { for(int j=0;j<3;j++) { if(i rel="nofollow">=j) System.out.print(a[i][j] + " "); else System.out.print(" "); } System.out.println(); }}} OUTPUT : The given matrix: 123 456 789 Upper triangle of matrix: 123 56 9 Lower triangle of matrix: 1 45 789

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19 Program to find the trace of a matrix class Trace { public static void main(String args[]) { int a[][]={{1,2,3},{4,5,6},{7,8,9}}; int i,j,sum=0; System.out.println("The given matrix : "); for(int i = 0; i <3; i++) { for(int j = 0; j <3; j++) System.out.print(a[i][j] + " "); System.out.println(); } for(i=0;i<3;i++) { for(j=0;j<3;j++) if(i==j) sum=sum+a[i][j]; } System.out.println("Trace is : " +sum); } } OUTPUT : The given matrix : 123 456 789 Trace is : 15

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20 Program to find the transpose of a matrix class Transpose { public static void main(String args[]) { int a[][]={{1,2,3},{4,5,6},{7,8,9}}; int i,j; System.out.println("The given matrix : "); for(int i = 0; i <3; i++) { for(int j = 0; j <3; j++) System.out.print(a[i][j] + " "); System.out.println(); } System.out.println("Transpose of Matrix : "); for(i=0;i<3;i++) { for(j=0;j<3;j++) System.out.print(a[j][i]+ " "); System.out.println(); } } } OUTPUT : The given matrix : 1 2 3 4 5 6 7 8 9 Transpose of Matrix : 1 4 7 2 5 8 3 6 9

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21 Program to find the product of two matrices class Mulm { public static void main(String args[]) { int a[][]={{1,2,3},{4,5,6},{7,8,9}}; int b[][]={{1,1,1},{0,1,0},{0,0,1}}; int c[][]= new int[3][3]; int i,j,k; for(i=0;i<3;i++) for(j=0;j<3;j++) for(k=0;k<3;k++) c[i][j]=c[i][j]+a[i][k]*b[k][j]; for(i=0;i<3;i++) { for(j=0;j<3;j++) System.out.print(+c[i][j]+ " "); System.out.println(); } } } OUTPUT : 1 3 4 4 9 10 7 15 16

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22 Program to demonstrate a CLASS class Democlass //Defining a class { int a=34;//Instance Variable of the class void showa() //Method of the class { System.out.println("a = " +a); } }//End of the class class A { public static void main(String args[]) { Democlass obj = new Democlass(); obj.showa(); } } OUTPUT : a=34

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23 Program to demonstrate a Constructor class Box { double width; double height; double depth; Box() { System.out.println("Constructing Box"); width=10; height=10; depth=10; } double volume() { return width*height*depth; } } class BoxDemo6 { public static void main(String args[]) { Box mybox1=new Box(); Box mybox2=new Box(); double vol; vol=mybox1.volume(); System.out.println("volume of is " +vol); vol=mybox2.volume(); System.out.println("volume of is " +vol); }} OUTPUT : Constructing Box Constructing Box volume of is 1000.0 volume of is 1000.0

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24 Program to demonstrate a Parameterized Constructor class Box { double width; double height; double depth; Box(double w,double h,double d) { width=w; height=h; depth=d; } double volume() { return width*height*depth; } } class BoxDemo7 { public static void main(String args[]) { Box mybox1=new Box(10,20,15); Box mybox2=new Box(3,6,9); double vol; vol=mybox1.volume(); System.out.println("volume of is " +vol); vol=mybox2.volume(); System.out.println("volume of is " +vol); } } OUTPUT : volume of is 3000.0 volume of is 162.0

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25 Program to Demonstrate THIS keyword class Box { double width; double height; double depth; Box(double width,double height,double depth) { this.width=width; this.height=height; this.depth=depth; } double volume() { return width* height* depth; } } class BoxThis { public static void main(String args[]) { double vol; Box mybox1=new Box(10,20,15); Box mybox2=new Box(3,6,9); vol=mybox1.volume(); System.out.println("Volume is " +vol); vol=mybox2.volume(); System.out.println("Volume is " +vol); } } OUTPUT : Volume is 3000.0 Volume is 162.0

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26 Program to Demonstrate Constructor Overloading

class Box { double width; double height; double depth; Box(double w,double h,double d) { width=w; height=h; depth=d; } Box() { width=-1; height=-1; depth=-1; } Box(double len) { width=height=depth=len; } double volume() { return width*height*depth; } }

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class OverloadCons { public static void main(String args[]) { Box mybox1=new Box(10,20,15); Box mybox2=new Box(); Box mycube=new Box(7); double vol; vol=mybox1.volume(); System.out.println("volume of mybox1 is " +vol); vol=mybox2.volume(); System.out.println("volume of mybox2 is " +vol); vol=mycube.volume(); System.out.println("volume of mycube is " +vol); } } OUTPUT : volume of mybox1 is 3000.0 volume of mybox2 is -1.0 volume of mycube is 343.0

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27 Program to pass objects as parameters

class Test { int a,b; Test(int i,int j) { a=i; b=j; } boolean equals(Test o) { if(o.a==a && o.b==b) return true; else return false; } } class PassOb { public static void main(String args[]) { Test ob1=new Test(100,22); Test ob2=new Test(100,22); Test ob3=new Test(-1,-1); System.out.println("ob1 == ob2 : " +ob1.equals(ob2)); System.out.println("ob1 == ob3 : " +ob1.equals(ob3)); } } OUTPUT : ob1 == ob2 : true ob1 == ob3 : false

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28 Program to Demonstrate Queue using Class class A { int q[] = new int[10]; int f,s; A() { f =-1; s=-1; } void push(int item) { if(f==9) System.out.println("Queue is Full"); else q[++f]=item; } int pop() { if(f==s) { System.out.println("Queue is Underflow"); return 0; } else return q[++s]; } }

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class que{ public static void main(String args[]){ A obj1 = new A(); for(int i=0;i<10;i++) obj1.push(i); System.out.println("Queue elements are : "); for(int i = 0 ;i<10;i++) System.out.println(obj1.pop()); } } OUTPUT : Queue elements are : 0 1 2 3 4 5 6 7 8 9

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29 Program to Demonstrate Stack using Class class A { int s[] = new int[10]; int tos; A() { tos=-1; } void push(int item) { if(tos==9) System.out.println("Stack is Full"); else s[++tos]=item; } int pop() { if(tos<0) { System.out.println("Stack is Underflow"); return 0; } else return s[tos--]; } }

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class stack{ public static void main(String args[]){ A obj1 = new A(); for(int i=0;i<10;i++) obj1.push(i); System.out.println("Stack elements are : "); for(int i = 0 ;i<10;i++) System.out.println(obj1.pop()); } } OUTPUT : Stack elements are : 9 8 7 6 5 4 3 2 1 0

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30 Program to Demonstrate Access Specifiers class Test { int a; public int b; private int c; void setc(int i) { c=i; } int getc() { return c; } } class AcessTest { public static void main(String args[]) { Test ob=new Test(); //These are OK,a and b may be accessed directly ob.a=10; ob.b=20; //This is not OK and will cause an error //ob.c=100; //error! //you must access c through its methods ob.setc(100); //Ok System.out.println("a,b,and c: " +ob.a+" " +ob.b +" "+ob.getc()); } } OUTPUT : a,b,and c: 10 20 100

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31 Program to Demonstrate Static Variables class Test { static int count; static { System.out.println("Welcome"); count=0; } Test() { count++; } } class Teststaticvariable { public static void main(String args[]) { Test t1=new Test(); Test t2=new Test(); Test t3=new Test(); System.out.println(Test.count + " objects are created"); } } OUTPUT : Welcome 3 objects are created

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32 Program to Demonstrate Static Methods class Mymath { static int add(int x,int y) { return(x+y); } static int subtract(int x,int y) { return (x-y); } static int square(int x) { return (x*x);} } class demostaticmethod { public static void main(String args[]) { System.out.println(Mymath.add(100,100)); System.out.println(Mymath.subtract(200,100)); System.out.println(Mymath.square(5)); } } OUTPUT : 200 100 25

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33 Program to demonstrate an Inner class class Outer { int outer_x=100; void test() { Inner inner=new Inner(); inner.display(); } class Inner { void display() { System.out.println("display: outer_x= "+outer_x); } } } class InnerClassDemo { public static void main(String args[]) { Outer outer=new Outer(); outer.test(); } } OUTPUT : display: outer_x= 100

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34 Program to Demonstrate Type Wrapping class Wrap { public static void main(String args[]) { Integer obj = new Integer(34); int x = obj.intValue(); System.out.println("x = " +x); System.out.println("obj = " +obj); } } OUTPUT : x = 34 obj = 34

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35 Program to Demonstrate Single Inheritance

class A { int i,j; void showij() { System.out.println("i and j : " +i+ " " +j); } }

class B extends A { int k; void showk() { System.out.println("k : "+k); } void sum() { System.out.println("i+j+k: "+(i+j+k)); } }

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class SimpleInheritance { public static void main(String args[]) { A superob = new A(); B subob = new B(); superob.i=10; superob.j=20; System.out.println("Contents of superob: "); superob.showij(); System.out.println(); subob.i=7; subob.j=8; subob.k=9; System.out.println("Contents of subob: "); subob.showij(); System.out.println(); System.out.println("Sum of i,j & k in subob: "); subob.sum(); } } OUTPUT : Contents of superob: i and j : 10 20 Contents of subob: i and j : 7 8 Sum of i,j & k in subob: i+j+k: 24

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36 Program to Demonstrate Multilevel Inheritance

class Student { int rollno; void getroll(int a) { rollno=a; } void putroll() { System.out.println("Roll number : "+rollno); } }

class Test extends Student //first level inheritence { int marks1,marks2; void getmarks(int x,int y) { marks1=x; marks2=y; } void putmarks() { System.out.println("Marks in subject1 = "+marks1); System.out.println("Marks in subject2 = "+marks2); } }

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class Result extends Test //second level derivation { float total; void display() { total=marks1+marks2; putroll(); putmarks(); System.out.println("Total = "+total); } }

class Multilevel { public static void main(String args[]) { Result student1 = new Result(); //object of class result is created student1.getroll(34); student1.getmarks(40,99); student1.display(); } } OUTPUT : Roll number : 34 Marks in subject1 = 40 Marks in subject2 = 99 Total = 139.0

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37 Program to Demonstrate hierarchical Inheritance class Student { int roll; void getroll(int x) { roll=x; } void putroll() { System.out.println(roll); } } class Result1 extends Student { int marks1; void getmarks1(int y) { marks1=y; } void showmarks1() { System.out.print("Roll no of 1st student is = "); putroll(); System.out.println("Marks of 1st student is = "+marks1); } }

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class Result2 extends Student { int marks2; void getmarks2(int z) { marks2=z; } void showmarks2() { System.out.print("Rollno of 2nd student is = "); putroll(); System.out.println("Marks of 2nd student is = "+marks2); }}

class Hierarchial { public static void main(String args[]) { Result1 r1 = new Result1(); Result2 r2 = new Result2();; r1.getroll(36); r1.getmarks1(99); r1.showmarks1(); r2.getroll(34); r2.getmarks2(40); r2.showmarks2(); } } OUTPUT : Roll no of 1st student is = 36 Marks of 1st student is = 99 Rollno of 2nd student is = 34 Marks of 2nd student is = 40

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38 Program to Demonstrate SUPER Class variable to reference a sub class object class A { int i,j; A(int a,int b) { i=a; j=b; } void show() { System.out.println("i and j: " +i + " " +j); }} class B extends A { int k; B(int a,int b,int c) { super(a,b); k=c; } void show() { System.out.println("k: "+k); }} class Supref { public static void main(String args[]) { B subOb=new B(1,2,3); A a; a=subOb; System.out.println("Using Sub Class Object :"); subOb.show(); System.out.println("Using Super class Variable : "); a.show(); }} OUTPUT : Using Sub Class Object : k: 3 Using Super class Variable : k: 3

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39 Program to Demonstrate Method Overriding class A { int i,j; A(int a,int b) { i=a; j=b; } void show() { System.out.println("i and j: " +i + " " +j); }} class B extends A { int k; B(int a,int b,int c) { super(a,b); k=c; } void show() { System.out.println("k: "+k); }} class Override { public static void main(String args[]) { B subOb=new B(1,2,3); subOb.show(); } } OUTPUT : k: 3

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40 Program to Demonstrate Runtime Polymorphism class figure { double dim1; double dim2; figure(double a,double b) { dim1=a; dim2=b; } double area() { System.out.println("area for figure is undefined"); return 0; } }

class rectangle extends figure { rectangle(double a,double b) { super(a,b); } double area() { System.out.println("Inside Area for rectangle"); return dim1*dim2; } }

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class triangle extends figure { triangle(double a,double b) { super(a,b); } double area() { System.out.println("Inside area for triangle"); return (dim1*dim2)/2; }} class FindAreas { public static void main(String args[]) { figure f=new figure(10,10); rectangle r=new rectangle(9,5); triangle t=new triangle(10,8); figure figref; figref=r; System.out.println("Area is " +figref.area()); figref=t; System.out.println("Area is " +figref.area()); figref=f; System.out.println("Area is " +figref.area()); }} OUTPUT : Inside Area for rectangle Area is 45.0 Inside area for triangle Area is 40.0 area for figure is undefined Area is 0.0

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41 Program to Demonstrate Abstract Class abstract class A { abstract void callme(); void callmetoo(){ System.out.println("this is a concrete method."); }} class B extends A { void callme() { System.out.println("B's implementation of callme."); }} class AbstractDemo { public static void main(String args[]) { B b=new B(); b.callme(); b.callmetoo(); } } OUTPUT : B's implementation of callme. this is a concrete method.

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42 Program to Demonstrate FINAL Keyword

class A { final int x =3; int y; A() { //x=4;this results in error y=4; } } class Finaldemo { public static void main(String args[]) { A a = new A(); System.out.println("x = " +a.x); System.out.println("y = " +a.y); //a.x=5;this also results in error a.y=6; System.out.println("x = " +a.x); System.out.println("y = " +a.y); } } OUTPUT : x=3 y=4 x=3 y=6

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43 Program to Demonstrate FINAL Method class A { int i,j; A(int a,int b) { i=a; j=b; } void show() { System.out.println("i and j: " +i + " " +j); } final void display() //Cannot be Overriden { System.out.println("i and j: " +i + " " +j); }} class B extends A { int k; B(int a,int b,int c) { super(a,b); k=c; } void show() { System.out.println("k: "+k); }} class Finalmeth { public static void main(String args[]) { B subOb=new B(1,2,3); System.out.println("Overriden Method call :"); subOb.show(); System.out.println("Final Method call :"); subOb.display(); }} OUTPUT : Overriden Method call : k: 3 Final Method call : i and j: 1 2

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44 Program to Demonstrate FINAL Class

final class Democlass //Cannot be inherited { int a=34; void showa() { System.out.println("a = " +a); } } class A { public static void main(String args[]) { Democlass obj = new Democlass(); obj.showa(); } }

OUTPUT : a=34

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45 Program to Demonstrate INTERFACE

interface Sum // defining Interface { int z=2;//final variable declared int add();//Abstract Method declared } class A implements Sum // Class implementing Interface { int x,y; public int add() { return x+y+z; } } class InterfaceDemo { public static void main(String args[]) { A a = new A(); a.x=14; a.y=18; System.out.println("Sum : " +a.add()); } } OUTPUT : Sum : 34

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46 Program to access implementation through Interface references

interface figure { double area(); }

class rectangle implements figure { double dim1,dim2; rectangle(double a,double b) { dim1=a;dim2=b; } public double area() { return dim1*dim2; } }

class triangle implements figure { double dim1,dim2; triangle(double a,double b) { dim1=a;dim2=b; } public double area() { return (dim1*dim2)/2; } }//implements through interface

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class demo { public static void main(String args[]) { rectangle r=new rectangle(100,50); triangle t=new triangle(10,20); figure f; f=r; System.out.println(f.area()); f=t; System.out.println(f.area()); } }

OUTPUT : 5000.0 100.0

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47 Program to Demonstrate EXTENDING INTERFACE interface A { void meth1(); void meth2(); } interface B extends A { void meth3(); } class Myclass implements B { public void meth1() { System.out.println("method1"); } public void meth2() { System.out.println("method2"); } public void meth3() { System.out.println("method3"); }} class Extint { public static void main(String args[]) { Myclass m = new Myclass(); m.meth1(); m.meth2(); m.meth3(); }} Output : method1 method2 method3

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48 Program to Demonstrate Stack using interface

interface stack { void push(int item); int pop(); } class A implements stack { int s[]; int tos; A(int size) { s = new int[size]; tos = -1; } public void push(int item) { if(tos == s.length-1) System.out.println("STACK is FULL"); else s[++tos]=item; } public int pop() { if(tos<0) { System.out.println("STACK IS EMPTY"); return 0; } else return s[tos--]; }}

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class S { public static void main(String args[]){ int i; A stack1 = new A(5); for(i=0;i<5;i++) stack1.push(i); System.out.println("Stack elements are : "); for(i =0;i<5;i++) System.out.println(stack1.pop()); } }

OUTPUT : Stack elements are : 4 3 2 1 0

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49 Program to Demonstrate Queue using Interface

interface queue { void push(int item); int pop(); } class B implements queue { int s[]; int f,l; B(int size) { s = new int[size]; f = -1; l = -1; } public void push(int item) { if(f == s.length-1) System.out.println("Q is FULL"); else s[++f]=item; } public int pop() { if(f==l) { System.out.println(" Q iS EMPTY"); return 0; } else return s[++l]; }}

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class Q { public static void main(String args[]){ int i; B q1=new B(8); for(i=0;i<8;i++) q1.push(i); System.out.println("Queue elements are : "); for(i =0;i<8;i++) System.out.println(q1.pop()); } }

OUTPUT : Queue elements are : 0 1 2 3 4 5 6 7

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50 Program to Demonstrate a SIMPLE PACKAGE package MyPack; public class Balance { String name; double bal; public Balance(string n,double b) { name=n; bal=b; } public void show() { if(bal<0) System.out.println("-->"); System.out.println(name+ ": $"+bal); }} -------------------------------------------------------------------------------------------------------import MyPack.*; class TestBalance { public static void main(string args[]) { BalanceTest=new Balance("Uday Satya",500); test.show(); } }

OUTPUT : Uday Satya : $500

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51 Program to Demonstrate Exception

class Excep { static void meth1() { int d=0; int a=10/d; } public static void main(String a[]) { Excep.meth1(); } }

OUTPUT : Exception in thread "main" java.lang.ArithmeticException: / by zero at Excep.meth1(Excep.java:6) at Excep.main(Excep.java:10)

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52 Program to Demonstrate TRY CATCH

class TC { public static void main(String a[]) { int c[]={2,4,6,8}; try { c[34]=99; } catch(ArrayIndexOutOfBoundsException e) { System.out.println("Array Index Out Of Bound "+e); } } }

OUTPUT : Array Index Out Of Bound java.lang.ArrayIndexOutOfBoundsException: 34

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53 Program to CATCH ARITHMETIC Exceptions

class trysimple { public static void main(String args[]) { int d,a; try { d = 0; a = 42/d; System.out.println("This will not Display"); } catch(ArithmeticException e) { System.out.println("Division by zero"); } System.out.println("After try/Catch Statements"); } }

OUTPUT : Division by zero After try/Catch Statements

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54 Program to demonstrate Multiple CATCH class trydemo1 { public static void main(String args[]) { try { int l=args.length; System.out.println("l = " +l); int b = 34/l; int c[]={0}; c[34]=100; System.out.println("End of Try Block"); } catch(ArithmeticException e) { System.out.println("Please Enter Command line Arguments"); } catch(ArrayIndexOutOfBoundsException e) { System.out.println("Your Array size is small"); } catch(Exception e) { System.out.println("Other type of Exception"); } }} OUTPUT : l=0 Please Enter Command line Arguments

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55 Program to demonstrate NESTED TRY

class NestTry { public static void main(String args[]) { try { int a = args.length; int b = 42 /a; System.out.println("a = "+ a); try { if(a==1) a = a/(a-a); if (a==2) { int c[] = {1}; c[42] = 99; } } catch(ArrayIndexOutOfBoundsException e) { System.out.println("Array index out-of-bounds:"+e); } } catch(ArithmeticException e) { System.out.println("Divide by 0:"+e); } } }

OUTPUT : Divide by 0:java.lang.ArithmeticException: / by zero

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56 Program to demonstrate FINALLY clause class trydemo{ public static void main(String args[]){ try{ int l=args.length; System.out.println("l = " +l); int b = 34/l; int c[]={0}; c[34]=100; System.out.println("End of Try Block"); } catch(ArithmeticException e) { System.out.println("Please Enter Command line Arguments"); } catch(ArrayIndexOutOfBoundsException e) { System.out.println("Your Array size is small"); } catch(Exception e) { System.out.println("Other type of Exception"); } finally{ System.out.println("This will be executed"); } }} OUTPUT : l=0 Please Enter Command line Arguments This will be executed

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57 Program to Demonstrate User Defined EXCEPTIONS class Myexception extends Exception { private int d; Myexception(int a) { d=a; } public String toString() { return "Myexception["+d+"]"; }} class UserExcep { static void compute(int a) throws Myexception { System.out.println("called compute("+a+")"); if(a>50) throw new Myexception(a); System.out.println("normal exit"); } public static void main(String a[]) { try { compute(34); compute(99); } catch(Myexception e) { System.out.println("caught "+e); }}} OUTPUT : called compute(34) normal exit called compute(99) caught Myexception[99]

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58 Program to Demonstrate Throws class ThrowsDemo { static void throwOne() throws IllegalAccessException { System.out.println("Inside throwOne."); throw new IllegalAccessException("demo"); } public static void main(String args[]) { try { throwOne(); } catch (IllegalAccessException e) { System.out.println("Caught "+e); } } } OUTPUT : Inside throwOne. Caught java.lang.IllegalAccessException: demo

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59 Program to demonstrate MULTITHREADING

class A extends Thread { public void run() { for(int i=1;i<=5;i++) System.out.println("\tfrom Thread A : i = " +i); System.out.println("Exit from A"); }}

class B extends Thread { public void run() { for(int j=1;j<=5;j++) System.out.println("\tfrom Thread B : j = " +j); System.out.println("Exit from B"); }}

class C extends Thread { public void run() { for(int k=1;k<=5;k++) System.out.println("\tfrom Thread C : k = " +k); System.out.println("Exit from C"); }}

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class Threadtest { public static void main(String args[]) { new A().start(); new B().start(); new C().start(); try{ Thread.sleep(10); } catch(InterruptedException e){ System.out.println("Exception " +e); } } } OUTPUT : from Thread A : i = 1 from Thread A : i = 2 from Thread A : i = 3 from Thread A : i = 4 from Thread A : i = 5 Exit from A from Thread B : j = 1 from Thread C : k = 1 from Thread B : j = 2 from Thread C : k = 2 from Thread B : j = 3 from Thread C : k = 3 from Thread B : j = 4 from Thread C : k = 4 from Thread B : j = 5 from Thread C : k = 5 Exit from B Exit from C

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60 Program to Demonstrate Runnable Interface

class A implements Runnable { public void run() { for(int i=1;i<=5;i++) System.out.println("\tfrom Thread A : i = " +i); System.out.println("Exit from A"); }}

class B implements Runnable { public void run() { for(int j=1;j<=5;j++) System.out.println("\tfrom Thread B : j = " +j); System.out.println("Exit from B"); }}

class C implements Runnable{ public void run(){ for(int k=1;k<=5;k++) System.out.println("\tfrom Thread C : k = " +k); System.out.println("Exit from C"); }}

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class Runnabletest{ public static void main(String args[]){ A a = new A(); B b = new B(); C c = new C(); Thread t1 = new Thread(a); t1.start(); Thread t2 = new Thread(b); t2.start(); Thread t3 = new Thread(c); t3.start(); try{ Thread.sleep(10); } catch(InterruptedException e){ System.out.println("Exception " +e); }}} OUTPUT : from Thread A : i = 1 from Thread B : j = 1 from Thread C : k = 1 from Thread A : i = 2 from Thread B : j = 2 from Thread C : k = 2 from Thread A : i = 3 from Thread B : j = 3 from Thread C : k = 3 from Thread A : i = 4 from Thread B : j = 4 from Thread C : k = 4 from Thread A : i = 5 from Thread B : j = 5 from Thread C : k = 5 Exit from A Exit from B Exit from C

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61 Program to Demonstrate Thread Priorities

class A extends Thread { public void run() { for(int i=1;i<=5;i++) System.out.println("\tfrom Thread A : i = " +i); System.out.println("Exit from A"); }}

class B extends Thread{ public void run(){ for(int j=1;j<=5;j++) System.out.println("\tfrom Thread B : j = " +j); System.out.println("Exit from B"); }}

class C extends Thread{ public void run(){ for(int k=1;k<=5;k++) System.out.println("\tfrom Thread C : k = " +k); System.out.println("Exit from C"); }}

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class Prioritytest { public static void main(String args[]){ A a = new A(); B b = new B(); C c = new C(); c.setPriority(Thread.MAX_PRIORITY); b.setPriority(a.getPriority()+1); a.setPriority(Thread.MIN_PRIORITY); a.start(); b.start(); c.start(); } } OUTPUT : from Thread C : k = 1 from Thread B : j = 1 from Thread A : i = 1 from Thread C : k = 2 from Thread B : j = 2 from Thread A : i = 2 from Thread C : k = 3 from Thread B : j = 3 from Thread A : i = 3 from Thread C : k = 4 from Thread B : j = 4 from Thread A : i = 4 from Thread C : k = 5 from Thread B : j = 5 from Thread A : i = 5 Exit from C Exit from B Exit from A

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62 Program to Demonstrate Synchronized Block

class Callme { void call(String msg) { System.out.print("[" +msg); try { Thread.sleep(1000); } catch(InterruptedException e) { System.out.println("Interrupted"); } System.out.println("]"); } }

class Caller implements Runnable { String msg; Callme target; Thread t; public Caller(Callme targ, String s) { target=targ; msg=s; t=new Thread(this); t.start(); } public void run() { synchronized(target) { target.call(msg); }}}

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class SynchBlock { public static void main(String args[]) { Callme target=new Callme(); Caller ob1=new Caller(target, "Hello"); Caller ob2=new Caller(target, "Synchronized"); Caller ob3=new Caller(target, "World"); try { ob1.t.join(); ob2.t.join(); ob3.t.join(); } catch(InterruptedException e) { System.out.println("Interrupted"); } } }

OUTPUT : [Hello] [Synchronized] [World]

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63 Program to Demonstrate Synchronized Method

class Callme { synchronized void call(String msg) { System.out.print("[" +msg); try { Thread.sleep(1000); } catch(InterruptedException e) { System.out.println("Interrupted"); } System.out.println("]"); }}

class Caller implements Runnable { String msg; Callme target; Thread t; public Caller(Callme targ, String s) { target=targ; msg=s; t=new Thread(this); t.start(); } public void run() { target.call(msg); }}

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class SynchMeth { public static void main(String args[]) { Callme target=new Callme(); Caller ob1=new Caller(target, "Hello"); Caller ob2=new Caller(target, "Synchronized"); Caller ob3=new Caller(target, "World"); try { ob1.t.join(); ob2.t.join(); ob3.t.join(); } catch(InterruptedException e) { System.out.println("Interrupted"); } } }

OUTPUT : [Hello] [Synchronized] [World]

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64 Program to Demonstrate Deadlock class A { synchronized void foo(B b) { String name=Thread.currentThread().getName(); System.out.println(name+ " entered A.foo"); try { Thread.sleep(1000); } catch(Exception e) { System.out.println("A Interrupted"); } System.out.println(name+ " trying to call B.last()"); b.last(); } synchronized void last() { System.out.println("Inside A.last"); }} class B { synchronized void bar(A a) { String name=Thread.currentThread().getName(); System.out.println(name+ " entered B.bar"); try { Thread.sleep(1000); } catch(Exception e) { System.out.println("B Interrupted"); } System.out.println(name+ " trying to call A.last()"); a.last(); } synchronized void last() { System.out.println("Inside A.last"); }}

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class Deadlock implements Runnable { A a=new A(); B b=new B(); Deadlock() { Thread.currentThread().setName("mainThread"); Thread t=new Thread(this, "RacingThread"); t.start(); a.foo(b); System.out.println("Back in main thread"); } public void run() { b.bar(a); System.out.println("Back in other thread"); } public static void main(String args[]) { new Deadlock(); } }

OUTPUT : mainThread entered A.foo RacingThread entered B.bar mainThread trying to call B.last() RacingThread trying to call A.last()

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65 Program to Demonstrate Thread Methods class Q { int n; boolean valueSet= false; synchronized int get() { if(!valueSet) try { wait(); } catch(InterruptedException ie) { System.out.println("InterruptedException caught"); } System.out.println("Got: " + n); valueSet=false; notify(); return n; } synchronized void put(int n) { if(valueSet) try { wait(); } catch(InterruptedException ie) { System.out.println("InterruptedException caught"); } this.n=n; valueSet=true; System.out.println("Put: " + n); notify(); }} class Producer implements Runnable { Q q; Producer(Q q) { this.q=q; new Thread(this, "Producer").start(); } public void run() { © www.udaysatya.blogspot.com

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int i=0; while(true) { q.put(i++); }}} class Consumer implements Runnable { Q q; Consumer(Q q) { this.q=q; new Thread(this, "Consumer").start(); } public void run() { int i=0; while(true) { q.get(); }}} class PCFixed { public static void main(String args[]) { Q q=new Q(); new Producer(q); new Consumer(q); System.out.println("Press Control-C to stop."); }} OUTPUT : Put : 1 Got : 1 Put : 2 Got : 2 Put : 3 Got : 3 Put : 4 Got : 4 Put : 5 Got : 5

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66 Program to Create Threads using Thread Class

class A extends Thread { public void run() { for(int i=1;i<=5;i++) System.out.println("\tfrom Thread A : i = " +i); System.out.println("Exit from A"); } }

class B extends Thread { public void run() { for(int j=1;j<=5;j++) System.out.println("\tfrom Thread B : j = " +j); System.out.println("Exit from B"); } }

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class Threadtest { public static void main(String args[]) { new A().start(); new B().start(); try{ Thread.sleep(10); } catch(InterruptedException e) { System.out.println("Exception " +e); } } }

OUTPUT : from Thread A : i = 1 from Thread B : j = 1 from Thread A : i = 2 from Thread B : j = 2 from Thread A : i = 3 from Thread B : j = 3 from Thread A : i = 4 from Thread B : j = 4 from Thread A : i = 5 from Thread B : j = 5 Exit from A Exit from B

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67 Program to Demonstrate Join() & isAlive() methods class NewThread implements Runnable { String name; Thread t; NewThread(String threadname) { name=threadname; t= new Thread(this,name); System.out.println("New Thread: "+t); t.start(); } public void run() { try { for(int i=5;i>0;i--) { System.out.println(name + ": " +i); Thread.sleep(1000); }} catch (InterruptedException ie) { System.out.println(name + "interrupted."); } System.out.println(name + "exiting."); }} class DemoJoin { public static void main(String args[]) { NewThread ob1= new NewThread("One"); NewThread ob2= new NewThread("Two"); NewThread ob3= new NewThread("Three"); System.out.println("Thread One is alive: "+ ob1.t.isAlive()); System.out.println("Thread Two is alive: "+ ob2.t.isAlive()); System.out.println("Thread Three is alive: "+ ob3.t.isAlive()); try { System.out.println("Waiting for threads to finish."); ob1.t.join(); ob2.t.join(); ob3.t.join(); } catch (InterruptedException ie) { System.out.println("Main thread Interrupted"); } System.out.println("Thread One is alive: "+ ob1.t.isAlive()); © www.udaysatya.blogspot.com

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System.out.println("Thread Two is alive: "+ ob2.t.isAlive()); System.out.println("Thread Three is alive: "+ ob3.t.isAlive()); System.out.println("Main thread exiting."); }} OUTPUT : New Thread: Thread[One,5,main] New Thread: Thread[Two,5,main] One: 5 Two: 5 New Thread: Thread[Three,5,main] Thread One is alive: true Three: 5 Thread Two is alive: true Thread Three is alive: true Waiting for threads to finish. Two: 4 One: 4 Three: 4 Two: 3 One: 3 Three: 3 Two: 2 One: 2 Three: 2 Two: 1 One: 1 Three: 1 Twoexiting. Oneexiting. Threeexiting. Thread One is alive: false Thread Two is alive: false Thread Three is alive: false Main thread exiting.

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68 Program to Demonstrate Get User Input from Keyboard import java.io.*; class GetUserInput { public static void main(String[] args) { //the data that will be entered by the user String name; //an instance of the BufferedReader class //will be used to read the data BufferedReader reader; //specify the reader variable //to be a standard input buffer reader = new BufferedReader(new InputStreamReader(System.in)); //ask the user for their name System.out.print("What is your name? "); try{ //read the data entered by the user using //the readLine() method of the BufferedReader class //and store the value in the name variable name = reader.readLine(); //print the data entered by the user System.out.println("Your name is " + name); } catch (IOException ioe){ //statement to execute if an input/output exception occurs System.out.println("An unexpected error occured."); } } } OUTPUT : What is your name? Uday Satya Your name is Uday Satya

© www.udaysatya.blogspot.com

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69 Program to Create a Frame Window using Applet import java.awt.*; import java.awt.event.*; import java.applet.*; /* */ class FrameTest extends Frame { FrameTest(String title) { super(title); MyWindowAdapter adap=new MyWindowAdapter(this); addWindowListener(adap); } public void paint(Graphics g) { g.drawString("This is in frame window",10,40); }} class MyWindowAdapter extends WindowAdapter { FrameTest ft; public MyWindowAdapter(FrameTest ft) { this.ft=ft; } public void WindowClosing(WindowEvent we) { ft.setVisible(false); }} public class AppletFrameWindowEx1 extends Applet { Frame f; public void init() { f=new FrameTest("A frame Window"); f.setSize(300,300); f.setVisible(true); } public void start() { f.setVisible(true); } © www.udaysatya.blogspot.com

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public void stop() { f.setVisible(false); } public void paint(Graphics g) { g.drawString("This is a Test applet",10,20); }}

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70 Program to Demonstrate Life cycle of methods in Applet import java.awt.*; import java.applet.*; /* */ public class Sample extends Applet { String msg; public void init() { setBackground(Color.cyan); setForeground(Color.red); msg="Inside init()--"; } public void start() { msg +="Inside start()--"; } public void paint(Graphics g) { msg +="Inside paint()--"; g.drawString(msg,10,30); }}

© www.udaysatya.blogspot.com

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71 Program to display Parameters of HTML import java.awt.*; import java.applet.*; /* <param name=fontName value=Courier> <param name=fontSize value=14> <param name=leading value=2> <param name=accountEnabled value=true> */ public class ParamDemo extends Applet { String fontName; int fontSize; float leading; boolean active; public void start() { String param; fontName=getParameter("fontName"); if(fontName==null) fontName="Not Found"; param=getParameter("fontSize"); try { if(param != null) fontSize=Integer.parseInt(param); else fontSize=0; } catch(NumberFormatException e) { fontSize=-1; } param = getParameter("leading"); try { if(param != null) leading = Float.valueOf(param).floatValue(); else © www.udaysatya.blogspot.com

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leading=0; } catch(NumberFormatException e) { leading=-1; } param=getParameter("accountEnabled"); if(param != null) active = Boolean.valueOf(param).booleanValue(); } public void paint(Graphics g) { g.drawString("Font name: "+fontName,0,10); g.drawString("Font size: "+fontSize,0,26); g.drawString("Leading: "+leading,0,42); g.drawString("Account Active: "+active,0,58); } }

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72 Program to Demonstrate all shapes in Graphics class import java.awt.*; import java.applet.*; /* */ public class FigPaint extends Applet { public void paint(Graphics g) { g.drawLine(0,0,100,100); g.drawRect(10,10,60,50); g.fillRect(100,10,60,50); g.drawOval(10,10,50,50); g.fillOval(100,10,75,50); g.drawArc(10,40,70,70,0,75); g.fillArc(100,40,70,70,0,75); } }

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73 Program to Show a Hut,Mountains & Face import java.awt.*; import java.applet.*; /* */ public class house extends Applet { public void paint(Graphics g) { setBackground(Color.black); setForeground(Color.white); g.drawLine(330,220,400,120); g.drawLine(400,120,470,220); g.drawLine(349,200,349,300); g.drawLine(450,200,450,300); g.drawLine(349,300,450,300); g.drawRect(385,260,20,40); g.drawRect(420,220,15,15); g.fillOval(80,50,40,40); setBackground(Color.black); g.drawLine(20,380,60,130); g.drawLine(60,130,100,360); g.drawLine(100,360,140,140); g.drawLine(140,140,180,340); g.drawLine(180,340,220,150); g.drawLine(220,150,260,320); g.drawLine(260,320,315,165); g.drawLine(315,165,335,210); g.drawOval(330,350,130,40); g.drawOval(550,60,60,60); g.drawOval(565,80,10,10); g.drawOval(585,80,10,10); g.drawArc(566,81,30,30,0,-180); g.drawLine(580,120,580,300); © www.udaysatya.blogspot.com

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g.drawLine(520,190,580,160); g.drawLine(580,160,640,190); g.drawLine(530,340,580,300); g.drawLine(580,300,630,340); } }

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74 Program to Show Status of Applet Window import java.awt.*; import java.applet.*; /* */ public class StatusWindow extends Applet { public void init() { setBackground(Color.cyan); } public void paint(Graphics g) { g.drawString("This is in the applet window.",10,20); showStatus("This is shown in the status window."); } }

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75 Program to Show Position of the Mouse in Applet Window import java.awt.*; import java.awt.event.*; import java.applet.*; public class AppWindow extends Frame { String keymsg = ""; String mousemsg = ""; int mouseX=30, mouseY=30; public AppWindow() { addKeyListener(new MyKeyAdapter(this)); addMouseListener(new MyMouseAdapter(this)); addWindowListener(new MyWindowAdapter()); } public void paint(Graphics g) { g.drawString(keymsg,10,40); g.drawString(mousemsg,mouseX,mouseY); } public static void main(String args[]) { AppWindow appwin=new AppWindow(); appwin.setSize(new Dimension(400,200)); appwin.setTitle("an AWT-Based Application"); appwin.setVisible(true); } } class MyKeyAdapter extends KeyAdapter { AppWindow appWindow; public MyKeyAdapter(AppWindow appWindow) { this.appWindow=appWindow; }

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public void keyTyped(KeyEvent ke) { appWindow.keymsg +=ke.getKeyChar(); appWindow.repaint(); };} class MyMouseAdapter extends MouseAdapter { AppWindow appWindow; public MyMouseAdapter(AppWindow appWindow) { this.appWindow=appWindow; } public void mousePressed(MouseEvent me) { appWindow.mouseX=me.getX(); appWindow.mouseY=me.getY(); appWindow.mousemsg="Mouse Down at "+appWindow.mouseX +", "+appWindow.mouseY; appWindow.repaint(); }} class MyWindowAdapter extends WindowAdapter { public void windowClosing(WindowEvent we) { System.exit(0); }}

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76 Program to Demonstrate Colors import java.awt.*; import java.applet.*; /* */ public class Colordemo extends Applet{ public void paint(Graphics g){ Color c1 = new Color(255,100,100); Color c2 = new Color(10,255,100); Color c3 = new Color(100,200,255); g.setColor(c1); g.drawLine(110,50,100,100); g.drawLine(130,100,100,40); g.setColor(c2); g.fillRect(60,120,50,50); g.setColor(c3); g.fillOval(20,30,70,70); g.setColor(Color.black); g.fillRect(120,50,180,90); }}

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77 Program to Pass Parameters perform Mathematical Operations import java.awt.*; import java.applet.*; /*<APPLET CODE = "HelloJavaParam1.class" WIDTH=400 HEIGHT=200> <Param Name="num1" value="55"> <Param Name="num2" value="35"> */ public class HelloJavaParam1 extends Applet { int a,b; public void start() { a=Integer.parseInt(getParameter("num1")); //recieving parameter value b=Integer.parseInt(getParameter("num2")); //recieving parameter value } public void paint(Graphics g) { g.drawString(" a = "+a +" b = "+b,20,50); g.drawString("Mathematical Operation",20,70); g.drawString("Sum = "+(a+b),20,100); g.drawString("Difference = "+(a-b),20,120); g.drawString("Product = "+(a*b),20,140); g.drawString("Mod = "+(a%b),20,160); } }

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78 Program To Get Document Code Bases import java.awt.*; import java.applet.*; import java.net.*; /* */ public class Bases extends Applet{ // Display code and document bases. public void paint(Graphics g) { String msg; URL url = getCodeBase(); // get code base msg = "Code base: " + url.toString(); g.drawString(msg, 10, 20); url = getDocumentBase(); // get document base msg = "Document base: " + url.toString(); g.drawString(msg, 10, 40); } }

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79 Program to Show an Image import java.awt.*; import java.applet.*; /* */ public class DrawImageApp extends Applet { Image i; public void start() { i = getImage(getDocumentBase(),"sunflower.jpg"); } public void paint(Graphics g) { g.drawImage(i,50,50,this); } }

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80 Program to Show an Image import java.awt.*; import java.applet.*; /* */ public class SimpleBanner extends Applet implements Runnable { String msg = " A Simple Moving Banner."; Thread t = null; int state; boolean stopFlag; // Set colors and initialize thread. public void init() { setBackground(Color.cyan); setForeground(Color.red); } // Start thread public void start() { t = new Thread(this); stopFlag = false; t.start(); } // Entry point for the thread that runs the banner. public void run() { char ch; // Display banner for( ; ; ) { try { repaint(); Thread.sleep(250); ch = msg.charAt(0); msg = msg.substring(1, msg.length()); msg += ch; © www.udaysatya.blogspot.com

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if(stopFlag) break; } catch(InterruptedException e) {} } } // Pause the banner. public void stop() { stopFlag = true; t = null; } // Display the banner. public void paint(Graphics g) { g.drawString(msg, 50, 30); } }

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81 Program to demonstrate an Adapter import java.awt.*; import java.awt.event.*; import java.applet.*; /* */ public class AdapterDemo extends Applet { public void init() { addMouseListener(new MyMouseAdapter(this)); addMouseMotionListener(new MyMouseMotionAdapter(this)); }} class MyMouseAdapter extends MouseAdapter{ AdapterDemo adapterDemo; public MyMouseAdapter(AdapterDemo adapterDemo) { this.adapterDemo = adapterDemo; } public void mouseClicked(MouseEvent me) { adapterDemo.showStatus("Mouse clicked"); }} class MyMouseMotionAdapter extends MouseMotionAdapter{ AdapterDemo adapterDemo; public MyMouseMotionAdapter(AdapterDemo adapterDemo) { this.adapterDemo = adapterDemo; } public void mouseDragged(MouseEvent me) { adapterDemo.showStatus("Mouse dragged"); }}

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82 Program to Demonstrate Button import java.applet.*; import java.awt.*; import java.awt.event.*; /* */ public class demobutton extends Applet implements ActionListener { String msg=""; Button b1,b2; public void init() { b1=new Button("OK"); b2=new Button("CANCEL"); add(b1); add(b2); b1.addActionListener(this); b2.addActionListener(this); } public void actionPerformed(ActionEvent e) { String s=e.getActionCommand(); if(s.equals("OK")) { msg="You pressed OK"; } else { msg="You pressed CANCEL"; } repaint(); } public void paint(Graphics g){ g.drawString(msg,40,40); } } © www.udaysatya.blogspot.com

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83 Program to Demonstrate Checkbox import java.applet.*; import java.awt.*; import java.awt.event.*; /* */ public class democheckbox extends Applet implements ItemListener { String msg=""; Checkbox c1,c2,c3; public void init() { c1=new Checkbox("JAVA",null,true); c2=new Checkbox("VB"); c3=new Checkbox("ORACLE"); add(c1); add(c2); add(c3); c1.addItemListener(this); c2.addItemListener(this); c3.addItemListener(this); } public void itemStateChanged(ItemEvent e) { repaint(); } public void paint(Graphics g) { msg="JAVA:"+c1.getState(); g.drawString(msg,40,40); msg="VB:"+c2.getState(); g.drawString(msg,40,60); msg="ORACLE:"+c3.getState(); g.drawString(msg,40,80); }}

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84 Program to Demonstrate Radio Buttons (CheckboxGroup) import java.applet.*; import java.awt.*; import java.awt.event.*; /* */ public class democheckboxgrp extends Applet implements ItemListener { String msg=""; Checkbox c1,c2,c3; CheckboxGroup cg; public void init() { cg=new CheckboxGroup(); c1=new Checkbox("JAVA",cg,true); c2=new Checkbox("VB",cg,false); c3=new Checkbox("ORACLE",cg,false); add(c1); add(c2); add(c3); c1.addItemListener(this); c2.addItemListener(this); c3.addItemListener(this); } public void itemStateChanged(ItemEvent e) { repaint(); } public void paint(Graphics g) { msg="curently selected:"+cg.getSelectedCheckbox().getLabel(); g.drawString(msg,40,40); } }

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85 Program to Demonstrate Choice import java.applet.*; import java.awt.*; import java.awt.event.*; /* */ public class demochoice extends Applet implements ItemListener { Choice c; public void init() { c=new Choice(); c.addItem("Red"); c.addItem("Green"); c.addItem("Blue"); add(c); c.addItemListener(this); } public void itemStateChanged(ItemEvent e) { String st=c.getSelectedItem(); if(st.equals("Red")) { setBackground(Color.red); } if(st.equals("Green")) { setBackground(Color.green); } if(st.equals("Blue")) { setBackground(Color.blue);}}}

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86 Program to Demonstrate File Dialog import java.awt.*; import java.awt.event.*; import java.applet.*; /* */ class TestMenu extends Frame { String msg=""; CheckboxMenuItem workoff; TestMenu(String title) { super(title); MenuBar mbar=new MenuBar(); setMenuBar(mbar); Menu file=new Menu("File"); MenuItem i1,i2,i3,i4,i5; file.add(i1=new MenuItem("New....")); file.add(i2=new MenuItem("Open....")); file.add(i3=new MenuItem("Save....")); file.add(i4=new MenuItem("-")); file.add(i5=new MenuItem("Quit....")); mbar.add(file); Menu edit=new Menu("Edit"); MenuItem i6,i7,i8,i9; edit.add(i6=new MenuItem("Cut....")); edit.add(i7=new MenuItem("Copy....")); edit.add(i8=new MenuItem("Paste....")); edit.add(i9=new MenuItem("-")); Menu submenu1=new Menu("Text Size..."); MenuItem i10,i11; submenu1.add(i10=new MenuItem("Large....")); submenu1.add(i11=new MenuItem("Small....")); edit.add(submenu1); workoff=new CheckboxMenuItem("Work Offline"); edit.add(workoff); mbar.add(edit); Mymenuhandler handler=new Mymenuhandler(this); © www.udaysatya.blogspot.com

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i1.addActionListener(handler); i2.addActionListener(handler); i3.addActionListener(handler); i5.addActionListener(handler); i6.addActionListener(handler); i7.addActionListener(handler); i8.addActionListener(handler); i10.addActionListener(handler); i11.addActionListener(handler); workoff.addItemListener(handler); } public void paint(Graphics g) { g.drawString(msg,10,100); if(workoff.getState()) g.drawString("Checked",10,200); else g.drawString("Unchecked",10,200); }} class Mymenuhandler implements ActionListener,ItemListener{ TestMenu tm; Mymenuhandler(TestMenu tm) { this.tm=tm; } public void actionPerformed(ActionEvent ae) { String msg=" You selected"; String s=ae.getActionCommand(); if(s.equals("New....")) msg="New"; else if(s.equals("Quit....")) { TestDialog d=new TestDialog(tm,"Confirm Exit Dialog"); d.setVisible(true); } else if(s.equals("Open....")) { FileDialog fopen=new FileDialog(tm,"Open a File",FileDialog.LOAD); fopen.setVisible(true); msg="You selected "+fopen.getDirectory()+" "+fopen.getFile(); }

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else if(s.equals("Save....")) { FileDialog fsave=new FileDialog(tm,"Save a File",FileDialog.SAVE); fsave.setVisible(true); }} public void itemStateChanged(ItemEvent ie) { tm.repaint(); }} class TestDialog extends Dialog implements ActionListener { Frame f; String s; Button b,b1; TestDialog(Frame f,String title) { super(f,title,false); this.f=f; this.s=title; setLayout(new FlowLayout()); setSize(200,400); add(new Label("Are you sure you want to exit")); add(b=new Button("Yes")); add(b1=new Button("No")); b.addActionListener(this); b1.addActionListener(this); } public void actionPerformed(ActionEvent e) { if(e.getSource() == b){ dispose(); f.setVisible(false); } else { dispose(); }}} public class DemoFileDialog extends Applet { Frame f; public void init() { f=new TestMenu("My Menu Frame"); f.setSize(300,500); f.setVisible(true); } © www.udaysatya.blogspot.com

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public void start() { f.setVisible(true); } public void stop() { f.setVisible(false); }}

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87 Program to Demonstrate Labels import java.applet.*; import java.awt.*; import java.awt.event.*; /* */ public class demolabel extends Applet { public void init() { Label nm=new Label("Name"); Label addr=new Label("Address"); //add labels to window add(nm); add(addr); } }

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88 Program to Demonstrate Lists import java.awt.*; import java.awt.event.*; import java.applet.*; /* */ public class ListDemo extends Applet implements ActionListener { List os,browser; String msg= ""; public void init() { os=new List(4,true); browser=new List(4,false); os.add("windows 98"); os.add("Windows NT"); os.add("Solaris"); os.add("MacOS"); browser.add("Netscape 1.1"); browser.add("Netscape 2.x"); browser.add("Netscape 3.x"); browser.add("Netscape 4.x"); browser.add("Internet Explorer 2.0"); browser.add("Internet Explorer 3.0"); browser.add("Internet Explorer 4.0"); browser.add("Lynx 2.4"); browser.select(1); add(os); add(browser); os.addActionListener(this); browser.addActionListener(this); }

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public void actionPerformed(ActionEvent ae) { repaint(); } public void paint(Graphics g) { int idx[]; msg="Current OS:"; idx=os.getSelectedIndexes(); for(int i=0; i
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89 Program to Demonstrate Menu import java.awt.*; import java.awt.event.*; import java.applet.*; /* */ class TestMenu extends Frame { String msg=""; CheckboxMenuItem workoff; TestMenu(String title) { super(title); MenuBar mbar=new MenuBar(); setMenuBar(mbar); Menu file=new Menu("File"); MenuItem i1,i2,i3,i4,i5; file.add(i1=new MenuItem("New....")); file.add(i2=new MenuItem("Open....")); file.add(i3=new MenuItem("Close....")); file.add(i4=new MenuItem("-")); file.add(i5=new MenuItem("Quit....")); mbar.add(file); Menu edit=new Menu("Edit"); MenuItem i6,i7,i8,i9; edit.add(i6=new MenuItem("Cut....")); edit.add(i7=new MenuItem("Copy....")); edit.add(i8=new MenuItem("Paste....")); edit.add(i9=new MenuItem("-")); Menu submenu1=new Menu("Text Size..."); MenuItem i10,i11; submenu1.add(i10=new MenuItem("Large....")); submenu1.add(i11=new MenuItem("Small....")); edit.add(submenu1); workoff=new CheckboxMenuItem("Work Offline"); edit.add(workoff); mbar.add(edit); Mymenuhandler handler=new Mymenuhandler(this); i1.addActionListener(handler); © www.udaysatya.blogspot.com

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i2.addActionListener(handler); i3.addActionListener(handler); i5.addActionListener(handler); i6.addActionListener(handler); i7.addActionListener(handler); i8.addActionListener(handler); i10.addActionListener(handler); i11.addActionListener(handler); workoff.addItemListener(handler); } public void paint(Graphics g) { g.drawString(msg,10,200); if(workoff.getState()) g.drawString("Checked",10,200); else g.drawString("Unchecked",10,200); }} class Mymenuhandler implements ActionListener,ItemListener { TestMenu tm; Mymenuhandler(TestMenu tm) { this.tm=tm; } public void actionPerformed(ActionEvent ae) { String msg=" You selected"; String s=ae.getActionCommand(); if(s.equals("New....")) msg="New"; else if(s.equals("Quit....")) { //activate a dialog box TestDialog d=new TestDialog(tm,"Confirm Exit Dialog"); d.setVisible(true); }} public void itemStateChanged(ItemEvent ie) { tm.repaint(); }}

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class TestDialog extends Dialog implements ActionListener { Frame f; String s; Button b,b1; TestDialog(Frame f,String title){ super(f,title,false); this.f=f; this.s=title; setLayout(new FlowLayout()); setSize(300,200); add(new Label("Are you sure you want to exit")); add(b=new Button("Yes")); add(b1=new Button("No")); b.addActionListener(this); b1.addActionListener(this); } public void actionPerformed(ActionEvent e) { if(e.getSource() == b){ dispose(); f.setVisible(false); } else { dispose(); }}} public class DemoMenu extends Applet { Frame f; public void init() { f=new TestMenu("My Menu Frame"); f.setSize(300,500); f.setVisible(true); } public void start() { f.setVisible(true); } public void stop() { f.setVisible(false); }}

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90 Program to Demonstrate Text Area import java.applet.*; import java.awt.*; import java.awt.event.*; public class DemoTextArea extends Applet implements ActionListener { TextArea remark; Button b1; String msg=""; public void init() { remark=new TextArea("Enter your remarks",5,50); b1=new Button("Show"); add(remark); add(b1); b1.addActionListener(this);} public void actionPerformed(ActionEvent e) { String s=e.getActionCommand(); if(s.equals("Show")) { msg=remark.getText(); repaint(); }} public void paint(Graphics g){ g.drawString(msg,130,160); }}

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91 Program to Make a Login Window import java.applet.*; import java.awt.*; import java.awt.event.*; public class login extends Applet implements ActionListener{ TextField un,pass; Button b1,b2; String msg=""; public void init(){ un=new TextField(12); pass=new TextField(8); pass.setEchoChar('*'); b1=new Button("Verify"); b2=new Button("Cancel"); add(un); add(pass); add(b1); add(b2); b1.addActionListener(this); b2.addActionListener(this); } public void actionPerformed(ActionEvent e){ String s=e.getActionCommand(); if(s.equals("Verify")){ String user=un.getText(); String pwd=pass.getText(); if(user.equals("student") && pwd.equals("loyola")){ msg="Login Successful"; } else msg="You cannot login.Check your username and password"; } else{ un.setText(""); pass.setText(""); msg=""; } repaint(); © www.udaysatya.blogspot.com

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} public void paint(Graphics g){ g.drawString(msg,40,40); }}//end of class

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92 Program to Make a Login Focus import java.applet.*; import java.awt.*; import java.awt.event.*; /* */ public class loginFocus extends Applet implements ActionListener,FocusListener { TextField un,pass; Button b1,b2; String msg=""; public void init() { un=new TextField(12); pass=new TextField(8); pass.setEchoChar('*'); b1=new Button("Verify"); b2=new Button("Cancel"); add(un); add(pass); add(b1); add(b2); un.addFocusListener(this); pass.addFocusListener(this); b1.addActionListener(this); b2.addActionListener(this); } public void focusGained(FocusEvent fe) { if(fe.getSource()==un) { un.setText("Enter UserName"); }} public void focusLost(FocusEvent fe) { if(fe.getSource()==pass) { if(pass.getText().equals("")) { msg="Enter the password to login"; repaint(); }}} public void actionPerformed(ActionEvent e) { String s=e.getActionCommand(); if(s.equals("Verify")){ © www.udaysatya.blogspot.com

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String user=un.getText(); String pwd=pass.getText(); if(user.equals("student") && pwd.equals("loyala")) { msg="Login Successful"; } else msg="You cannot login.Check your username and password"; } else { un.setText(""); pass.setText(""); msg=""; } repaint(); } public void paint(Graphics g){ g.drawString(msg,40,40); }}//end of class

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93 Program to Demonstrate Mouse Adapter import java.awt.event.*; import java.applet.*; public class MouseAdapterApplet extends Applet { public void init() { addMouseListener(new MouseAdapter(){ public void mousePressed(MouseEvent e){ showStatus("Mouse Pressed");}});}}

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94 Program to Demonstrate Mouse Events import java.awt.*; import java.awt.event.*; import java.applet.*; /* <Applet code=MouseEventsApplet width=400 height=100> */ public class MouseEventsApplet extends Applet implements MouseListener,MouseMotionListener { String msg; public void init() { msg=""; addMouseListener(this); addMouseMotionListener(this); } public void mouseClicked(MouseEvent e){ msg="mouseClicked"; repaint(); } public void mouseEntered(MouseEvent e){ msg="mouseentered"; repaint(); } public void mouseExited(MouseEvent e){ msg="mouseexit"; repaint();} public void mousePressed(MouseEvent e){ msg="mousepressed"; repaint();} public void mouseReleased(MouseEvent e){ msg="mousereleased"; repaint();} public void mouseDragged(MouseEvent e){ msg="*"; repaint(); } public void mouseMoved(MouseEvent e){ © www.udaysatya.blogspot.com

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msg="mousemoved"; repaint(); } public void paint(Graphics g){ g.drawString(msg,10,20); }}

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95 Program to Demonstrate the key event handlers import java.awt.*; import java.awt.event.*; import java.applet.*; /* */ public class SimpleKey extends Applet implements KeyListener { String msg = ""; int X = 10, Y = 20; // output coordinates public void init() { addKeyListener(this); requestFocus(); // request input focus } public void keyPressed(KeyEvent ke) { showStatus("Key Down"); } public void keyReleased(KeyEvent ke) { showStatus("Key Up"); } public void keyTyped(KeyEvent ke) { msg += ke.getKeyChar(); repaint(); } // Display keystrokes. public void paint(Graphics g) { g.drawString(msg, X, Y); } }

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96 Program to Demonstrate Border Layout import java.awt.*; import java.awt.event.*; import java.applet.*; /* */ public class TestBL extends Applet { public void init() { setLayout(new BorderLayout()); add(new Scrollbar(Scrollbar.HORIZONTAL),BorderLayout.NORTH); add(new Scrollbar(Scrollbar.HORIZONTAL),BorderLayout.SOUTH); add(new Scrollbar(Scrollbar.VERTICAL),BorderLayout.EAST); add(new Scrollbar(Scrollbar.VERTICAL),BorderLayout.WEST); add (new TextArea("I am in the center"),BorderLayout.CENTER); }}

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97 Program to Demonstrate Card Layout import java.awt.*; import java.awt.event.*; import java.applet.*; /* */ public class TestCL extends Applet implements ActionListener { Panel p,p1,p2; CardLayout cl1; Label l1; Button b1,b2; CheckboxGroup cbg; Checkbox c1,c2; public void init() { l1=new Label("Licesence Agreement"); b1=new Button("Accept"); b2=new Button("Exit"); cl1=new CardLayout(); p=new Panel(); p.setLayout(cl1); p1=new Panel(); p1.add(l1); p1. add(b1); p1.add(b2); p2=new Panel(); cbg=new CheckboxGroup(); c1=new Checkbox("Typical",cbg,true); c2=new Checkbox("Custom",cbg,false); p2.add(c1); p2.add(c2); p.add(p1,"panel1"); p.add(p2,"panel2"); add(p); b1.addActionListener(this); } public void actionPerformed(ActionEvent e) { © www.udaysatya.blogspot.com

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if(e.getSource() == b1) { cl1.show(p,"panel2"); }}

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98 Program to Test Fonts Using Mouse Events import java.awt.*; import java.awt.event.*; import java.applet.*; public class TestFonts extends Applet{ int n=0; Font f; String msg; public void init(){ f=new Font("Dialog",Font.PLAIN,12); msg="Hello World"; setFont(f); addMouseListener(new MyMouseAdapter(this)); } public void paint(Graphics g){ g.drawString(msg,10,40); }} class MyMouseAdapter extends MouseAdapter{ TestFonts tfonts; public MyMouseAdapter(TestFonts f){ tfonts=f; } public void mousePressed(MouseEvent e){ tfonts.n++; switch(tfonts.n){ case 1: tfonts.f=new Font("DialogInput",Font.BOLD,20); break; case 2: tfonts.f=new Font("SansSerif",Font.BOLD,22); break; case 3: tfonts.f=new Font("Serif",Font.BOLD,24); break; case 4: tfonts.f=new Font("Monospaced",Font.BOLD,26); break; } © www.udaysatya.blogspot.com

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if(tfonts.n==4){ tfonts.n=-1; tfonts.setFont(tfonts.f); tfonts.repaint(); }} }

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99 Program to Demonstrate Grid Layouts import java.awt.*; import java.awt.event.*; import java.applet.*; /* */ public class TestGL extends Applet{ public void init(){ setLayout(new FlowLayout(FlowLayout.CENTER)); add(new TextField("0")); setLayout(new GridLayout(3,3)); setFont(new Font("SansSerif",Font.BOLD,16)); for(int i=0;i<3;i++){ for(int j=0;j<3;j++){ int k=i*3+j; if(k>0) add(new Button(""+k)); }}}}

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100 Program to Demonstrate Scrollbar import java.awt.*; import java.awt.event.*; import java.applet.*; /* */ public class TestScrollBar extends Applet implements AdjustmentListener { Scrollbar s1,s2,s3; public void init() { s1=new Scrollbar(Scrollbar.HORIZONTAL,100,10,0,255); s2=new Scrollbar(Scrollbar.VERTICAL,50,10,0,255); s3=new Scrollbar(Scrollbar.VERTICAL,150,10,0,255); setLayout(new BorderLayout()); add(s1,BorderLayout.SOUTH); add(s2,BorderLayout.EAST); add(s3,BorderLayout.WEST); //register to recieve adjustment events s1.addAdjustmentListener(this); s2.addAdjustmentListener(this); s3.addAdjustmentListener(this); } public void adjustmentValueChanged(AdjustmentEvent e) { repaint(); }

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public void paint(Graphics g) { int r=s1.getValue(); int g1=s2.getValue(); int b=s3.getValue(); Color c=new Color(r,g1,b); setBackground(c); } }

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101 Program to Check JDBC Connection import java.sql.*; import java.util.*; public class JDBCDemo1 { public static void main(String[]args) throws Exception { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection c = DriverManager.getConnection("jdbc:odbc:MyDSN"); System.out.println("Connection Successfull"); c.close(); } } OUTPUT : Connection Successful

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102 Program to retrieve Records from Database import java.sql.*; public class TestRetrieveRecords { public static void main(String[] args) throws Exception { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con=DriverManager.getConnection("jdbc:odbc:mdbTEST"); Statement st = con.createStatement(); ResultSet rs = st.executeQuery("select * from emp"); System.out.println("*** Employee's Details *** \n"); while(rs.next()) { System.out.println("Employee Number: " + rs.getInt(1)); System.out.println("Employee Name: " + rs.getString(2)); System.out.println("Employee Salary: " + rs.getInt(3) + "\n"); } rs.close(); st.close(); con.close(); }} OUTPUT : *** Employee's Details *** Employee Number: 1 Employee Name: Uday Employee Salary: 6000 Employee Number: 2 Employee Name: Venkat Employee Salary: 4500 Employee Number: 3 Employee Name: Satish Employee Salary: 7000 Employee Number: 4 Employee Name: Vijay Employee Salary: 2000

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103 Program to demonstrate Insertion into Database import java.sql.*; import java.io.*; public class InsertDemo { public static void main(String[] args) throws Exception { int no=9; String name="Satya"; double sal=10000; Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection("jdbc:odbc:mdbTEST"); Statement st=con.createStatement(); st.executeUpdate("insert into Emp values("+ no + ",'"+ name +"',"+ sal +")"); System.out.println("*** Record Inserted Successfully ***\n"); st.close(); con.close(); }} OUTPUT : *** Record Inserted Successfully ***

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104 Program to demonstrate Update into Database import java.util.*; import java.sql.*; import java.io.*; public class JDBCUpdateDemo { public static void main(String[]args) throws Exception{ int eno=9; Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection c = DriverManager.getConnection("jdbc:odbc:mdbTEST"); Statement st=c.createStatement(); int i = st.executeUpdate("update Emp set Salary = Salary +1000 where Empid="+eno); System.out.println(i+"----record Updated"); st.close(); c.close(); }} OUTPUT : 1----record Updated

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105 Program to demonstrate Prepared Statement import java.sql.*; import java.io.*; public class JDBCPrepareDemo { public static void main(String[] args)throws Exception { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection("jdbc:odbc:mdbTEST"); PreparedStatement pst = con.prepareStatement("insert into Emp(Empid,Name,Salary) values(?,?,?)"); int no=104; pst.setInt(1,no); String name="RUVN"; pst.setString(2,name); int sal=14000; pst.setInt(3,sal); int i = pst.executeUpdate(); System.out.println(i+"--Record inserted"); pst.close(); con.close(); }} OUTPUT : 1--Record inserted

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106 Program to Demonstrate Data Entry using Applet import java.sql.*; import java.awt.*; import java.awt.event.*; public class JDBCDataEntry extends Frame implements ActionListener { Button ok,cancel; TextField t1,t2,t3; JDBCDataEntry() { setLayout(new FlowLayout()); ok=new Button("OK"); cancel=new Button("Cancel"); t1=new TextField(20); t2=new TextField(20); t3=new TextField(20); add(new Label("Employee Number : ")); add(t1); add(new Label("Employee Name : ")); add(t2); add(new Label("Employee Salary : ")); add(t3); add(ok); add(cancel); ok.addActionListener(this); cancel.addActionListener(this); setTitle("Employee's Registration Form"); setSize(350,300); setVisible(true); } public void actionPerformed(ActionEvent ae) { if(ae.getSource()==cancel) { t1.setText(""); t2.setText(""); © www.udaysatya.blogspot.com

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t3.setText(""); } if(ae.getSource()==ok) { int no=Integer.parseInt(t1.getText()); String name=t2.getText(); int sal=Integer.parseInt(t3.getText()); try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection("jdbc:odbc:mdbTEST"); Statement st=con.createStatement(); st.executeUpdate("insert into Emp values("+ no + ",'" + name + "' , " + sal + ")"); System.out.println("*******Registraiton performed*******"); st.close(); con.close(); } catch(Exception e) { System.out.println("Message: " + e); } } }

public static void main(String[] args) throws Exception { new JDBCDataEntry(); } }

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*******Registraiton performed*******

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107 Program to Demonstrate Result Set Meta Data import java.sql.*; public class JDBCRSMetaDataDemo { public static void main(String[] args) throws Exception { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection c = DriverManager.getConnection("jdbc:odbc:mdbTEST","scott","tiger"); String s="select * from emp"; Statement st=c.createStatement(); ResultSet rs=st.executeQuery(s); ResultSetMetaData rsm=rs.getMetaData(); rs.next(); System.out.println("No of columns in the table: "+ rsm.getColumnCount()); System.out.println(rsm.getColumnName(1)+" : "+rsm.getColumnTypeName(1)); System.out.println(rsm.getColumnName(2)+" : "+rsm.getColumnTypeName(2)); System.out.println(rsm.getColumnName(3)+" : "+rsm.getColumnTypeName(3)); rs.close(); st.close(); c.close(); } } OUTPUT : No of columns in the table: 3 Empid : INTEGER Name : VARCHAR Salary : INTEGER

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108 Program to Demonstrate Transaction handling import java.sql.*; public class JDBCTransDemo { public static void main(String a[]) { try{ Properties p=new Properties(); p.setProperty("uid","scott"); p.setProperty("password","tiger"); Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection("jdbc:odbc:MyDSN",p); //set the auto commit mode to false con.setAutoCommit(false); //create a transaction Statement st=con.createStatement(); int i= st.executeUpdate("insert into Emp values("+ no + ",'"+ name +"',"+ sal +")"); System.out.println("first row inserted but not commited"); //create another transaction Statement st=con.createStatement(); int j= st.executeUpdate("insert into Emp values("+ no + ",'"+ name +"',"+ sal +")"); System.out.println("second row inserted but not commited"); //commit the trans con.commit(); System.out.println("trans commited"); st.close(); con.close(); }catch(Exception e) { System.out.println("Error: "+e); } } }

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109 Program to Demonstrate Callable Statement import java.sql.*; import java.util.*; public class JDBCCallableDemo { public static void main(String[]args) throws Exception { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection c = DriverManager.getConnection("jdbc:odbc:MyDSN1"); String str= "{call emp_job(?,?,?)}"; //call a stored procedure CallableStatement cs=c.prepareCall(str); //pass the IN parameter cs.setInt(1,7839); //register the out parameters cs.registerOutParameter(2,Types.VARCHAR); cs.registerOutParameter(3,Types.VARCHAR); //process the stored procedure cs.execute(); //retrieve the data ename=cs.getString(2); ejob=cs.getString(3); //display the data System.out.println("Employee name: "+ename); System.out.println("Employee Job: "+ejob); cs.close(); c.close(); } }

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110 Program to Demonstrate Result Set Meta Data import java.sql.*; import java.util.*; import java.io.*; public class Rsmeta1 { public static void main(String[]args) throws Exception { Properties p=new Properties(); p.setProperty("uid","scott"); p.setProperty("password","tiger"); Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection c = DriverManager.getConnection("jdbc:odbc:student",p); Statement st=c.createStatement(); ResultSet rs=st.executeQuery("select * from student"); ResultSetMetaData rsmd = rs.getMetaData(); for(int i=0; i< rsmd.getColumnCount();i++) { System.out.print(rsmd.getColumnLabel(i+1)+" "); } System.out.println(); while(rs.next()) { System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getInt(3)+" "+rs.getInt(4)); } st.close(); c.close(); } }

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111 Program to Demonstrate Database Meta Data import java.sql.*; public class JDBCDBMetaDataDemo { public static void main(String[]args) throws Exception { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection c = DriverManager.getConnection("jdbc:odbc:MyDSN1","scott","tiger"); //create a DB metadata object DatabaseMetaData dbm=con.getMetaData(); //String[] tabtypes={"TABLES"}; ResultSet tabrs=dbm.getTables(null,null,null,"TABLE"); while(tabrs.next()) { System.out.println(tabrs.getString("TABLE_NAME")); } con.close(); } }

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112 Program to Demonstrate Add Interface

import java.util.*; import java.rmi.*; public interface RMIAddInterface extends java.rmi.Remote { int add(int a,int b ) throws RemoteException; }

113 Program to Demonstrate Add S erver import java.rmi.*; import java.rmi.server.UnicastRemoteObject; public class RMIAddServer { public static void main(String[] args) throws Exception { if(System.getSecurityManager() == null) { System.setSecurityManager( new RMISecurityManager() ); } RMIAddImpl myObject = new RMIAddImpl( "MYADDSERVER" ); System.out.println( "RMI Server ready..." ); } }

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114 Program to add Client import java.rmi.*; import java.rmi.registry.*; public class RMIAddClient { public static void main(String[] args) { try { if(System.getSecurityManager() == null) { System.setSecurityManager( new RMISecurityManager() ); } RMIAddInterface a = (RMIAddInterface)Naming.lookup("rmi://localhost/MYADDSERVER"); System.out.println( "The sum is:"+a.add(2,2)); } catch( Exception e ) { System.out.println( e ); } } }

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115 implementation for the interface import java.rmi.*; import java.rmi.server.UnicastRemoteObject; public class RMIAddImpl extends UnicastRemoteObject implements RMIAddInterface { public RMIAddImpl( String name ) throws RemoteException { try { Naming.rebind( name, this ); } catch( Exception e ) { System.out.println( e ); } } public int add( int a,int b ) { return (a+b); } }

116 Create a Policy to Allow Permission for Everyone grant { // Allow everything permission java.security.AllPermission; };

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