Java Programming

1. Which of the following is not a primitive data type in Java?

• int        

• float           

• String         

• Boolean

2. What is the purpose of encapsulation?

• To hide the implementation details of a class.

• To make code more efficient.

• To increase code complexity.

  d

• To reduce code readability.

 3. Which of the following is a conditional statement in Java?

• while

• if-else 

• for

• do-while

What will the following code output?

int x = 10;

4. while (x > 0) {

    System.out.println(x);

    x--;

}

• 10 9 8 7 6 5 4 3 2 1

• 1 2 3 4 5 6 7 8 9 10

• 10 9 8 7 6 5 4 3 2

• Infinite loop

5. What are the two main types of exceptions in Java?

• Compile-time and runtime exceptions.

• Checked and unchecked exceptions.

• Logical and syntax exceptions.

• Input and output exceptions.

6.What is the purpose of BufferedReader in Java?

                    

• To convert bytes into characters

• To read data from a file byte by byte 

• 6. To read data from a file line by line

• 6. To read data from a file line by line

7. What is the purpose of packages in Java?

• To provide a mechanism for accessing classes from different packages.

• To handle exceptions in Java.

• To define methods for handling input/output operations.

• To group related classes and interfaces together.

8.In java, what is an interface?

• A regular class

• fully abstract class

• A concrete class 

• A template class

9.Which component is used to display multiple lines of text?

• JTextArea

• JButton

• JLabel

• JTextField

10.Which class in Swing is used to create a window?

• JFrame

• JButton

• JLabel

• JTextArea