Lab Activity Java Basics Week 2 And 3 Part A

LAB ACTIVITY JAVA BASICS WEEK 2 AND 3 PART A 1. What is the difference between C++ object oriented programming approach and Java programming approach? 2. Which package is automatically imported by the Java system? 3. How to read data primitive using Java programming? 4. What does it means by the following statement "Java is a platform-independent language"? 5. What is the Java Virtual Machine (JVM)? 6. If you have the source code for a Java program, and you want to run that program, you will need both a compiler and an interpreter. What does the Java compiler do and what does the Java interpreter do? 7. Java is case-sensitive. What does it mean by that statement? 8. The class name must be the same as the file name. (Yes/No) 9. What does the following instruction print? System.out.println(“\nThis\nis\na\nJava\Programming”); 10. What is the difference between a variable and an object? 11. What are variables? (There are four different ideas associated with variables in Java. Try to mention all four aspects in your answer. Hint: One of the aspects is the variable's name.) 12. Which of the following is NOT a primitive data types? What is it’s data type? int, boolean, float, char, String 13. Declare an integer variable value with initial value 10. 14. Declare a double constant FIXEDPAID with value 10.5. 15. Write a Java statement that initializes a String object with your name. 16. By assuming that String object had been initialized with this word Welcome, write a Java statement that can print that word three times on the same line.

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17. Which object that allow user to read primitive data type values and strings? 18. What is a class data value? PART B Write, compile and run the following program: Exercise 1 public class TempConverter { public static void main(String[] args) { double fahrenheit = 100; double celsius; celsius = 0.56 * (fahrenheit - 32);

}

System.out.print(" degrees celsius is: "); System.out.print(celsius); System.out.println(" degrees fahrenheit:"); System.out.print(fahrenheit);

}

Exercise 2 (reading using JOption). import javax.swing.JOptionPane; public class Hello { //main method begins execution of Java application public static void main( String args[] ) { String firstNum; // first string entered by user String secondNum; // second string entered by user int num1; int num2;

// first number to add // second number to add

int sum;

// sum of number1 and number2

//read in first number from user as a string firstNum = JOptionPane.showInputDialog( "Enter first integer" );

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//read in second number from user as a string secondNum = JOptionPane.showInputDialog( "Enter second integer" ); //convert numbers from type String to type int num1 = Integer.parseInt( firstNum ); num2 = Integer.parseInt( secondNum ); // add numbers sum = num1 + num2; //display result JOptionPane.showMessageDialog( null, "The sum is: " + sum); System.exit(0); } } // end method main

//terminate application with window

Exercise 3 import java.util.*; import java.text.*; public class Circle { public static void main( String[] args ) { final double PI = 3.14159; double radius, area; DecimalFormat df = new DecimalFormat("0.0"); Scanner console = new Scanner(System.in); //Get input System.out.print("Enter radius: "); radius = console.nextDouble(); //Compute area and circumference area = PI * radius * radius; //Display the results System.out.println(""); System.out.println("Given Radius: " + radius); System.out.println("Area: " + df.format(area)); }

}

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Exercise 4 String name; int n; boolean startWord; name = "Nur Najla M. Hasif"; startWord = true; for (n = 0; n < name.length(); n++) { if (startWord) System.out.println(name.charAt(n)); if (name.charAt(n) == ' ') startWord = true; else startWord = false; }

Exercise 5 public static void main(String[] args) { int N; N = 1; while (N <= 32) { N = 2 * N; System.out.println(N); } }

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