Java Programming - MCQ Practice Questions

Which of the following statements about Java threads is correct?

What is the primary purpose of the volatile keyword in Java multithreading?

Which of the following will cause a deadlock situation?

Which collection class is thread-safe without explicit synchronization?

Which method is used to prevent race conditions by allowing only one thread to access a resource at a time?

Which of the following collections is thread-safe in Java?

What is the output of the following code? Thread t = new Thread(() -> System.out.println(Thread.currentThread().getName())); t.start();

Which method must be implemented to create a thread in Java?

What is the difference between start() and run() methods in threading?

Which of the following thread states is NOT a valid Java thread state?

Which of the following methods will cause a thread to release all locks it holds while waiting?

A developer needs to ensure that exactly 5 threads complete their tasks before proceeding to the next phase. Which synchronization utility is most appropriate?

Which of the following is a checked exception in Java?

Which exception is thrown when a method receives an illegal or inappropriate argument?

Can you have a try block without a catch block in Java?

Which of the following is NOT a subclass of Throwable in Java?

Which exception is thrown when trying to access a method of a null object?

Which exception is thrown when a string cannot be converted to a number?

What is the output of this code? public class Test { public static void main(String[] args) { try { int[] arr = {1, 2}; System.out.println(arr[5]); } catch (Exception e) { System.out.println("Caught"); } } }

In Java exception handling, what is the order of execution in try-finally-catch block?