Core Java Quiz(PTP)

1. 1. List out principles of OOPS

• Encapsulation

  Data abstraction

  Inheritance

• Class

  interface

  Structure

• Object

  Variable

  Constant

• Message Communication

  Polymorphism

  Interface

2. 2. What are Access Specifiers available in Java?

• private

  public

  protected

• private

  public

  protected

  default or friendly

• private

  void

  protected

• extends

  implements

  private

  protected

3. 3. Which of the following statement is true regarding static fields and static methods in programming? 

• 
  Static methods can access instance variables directly
  
  

• Static fields are specific to each instance of a class

• Static fields are shared among all instances of a class

• None

4. 4. Which event is triggered by clicking a button in a graphical user interface?

• ActionEvent

• KeyEvent

• MouseEvent

• ItemEvent

5. 5. Which of the following packages is always imported by default in Java?

• java.util

• java.lang

• java.awt

• java.applet

6. 6. what is size of int in Java?

• 2 bytes

• 1 byte

• 8 bytes

• 4 bytes

7. 7. What is the primary characteristic of a final method in Java?

• It can only be called within the class where it is defined.

• It can be overridden by subclasses.

• It cannot be overridden by subclasses.

• It is restricted to use in abstract classes.

8. 8. What is the purpose of the BufferedReader class in the java.io package?

• To write text to an output stream.

• To read text from a character input stream efficiently.

• To serialize an object to a file.

• To read binary data from an input stream.

9. 9. Which method is used to pause the execution of the current thread for a specified period?

• wait()

• suspend()

• notify()

• sleep()

10. 10. What is the purpose of the finally block in Java exception handling?

• To catch and handle exceptions.

• To throw exceptions.

• To execute code after a try block, regardless of whether an exception is thrown or not.

• To define exception handling for checked exceptions.