Available Questions About Java Quizzes

1. How do you declare an abstract method in Java?

• public abstract void methodName();
• public void methodName() { }
• abstract void methodName();
• public void abstract methodName();

2. What does the super keyword do in Java?

• It refers to the current class’s methods
• It refers to the parent class’s constructor or methods
• It creates a new instance of a class
• It refers to a superclass object

3. Which of the following statements about the final keyword in Java is true?

• It can be used to declare constants, prevent method overriding, and inheritance
• It is only used to prevent method overriding
• It is used to create mutable objects
• It is used to create abstract classes

4. What is the default value of a boolean variable in Java?

• true
• false
• 0
• null

5. How can you create a thread in Java?

• By using the Thread class’s run() method
• By extending the Thread class
• By implementing the Runnable interface
• Both b and c

6. Which of the following is the correct way to handle exceptions in Java?

• try { // code } catch (Exception e) { // handle }
• try { // code } finally { // handle }
• catch (Exception e) { // handle }
• try { // code } throw (Exception e) { // handle }

7. Which of the following statements is true about the finally block in Java?

• It executes only if an exception is thrown.
• It is executed only if no exception is thrown.
• It always executes regardless of whether an exception is thrown or not.
• It executes only if the catch block is present.

8. How can you ensure that a class cannot be subclassed in Java?

• By using the abstract keyword
• By using the final keyword
• By using the static keyword
• By using the private keyword

9. What is the default value of an instance variable of type int in Java?

• 0
• 1
• Null
• Undefined

10. Which of the following is not a valid data type in Java?

• int
• float
• integer
• char