Unit 4

What is multithreading in Java?

• Running multiple instances of the same Java program

• Running multiple threads within a single Java program

• Running multiple Java programs simultaneously

• Running Java code on multiple cores

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

• Runnable

• Threadable

• Executor

• Multithread

What is the recommended way to create a thread in Java?

• Extending the Thread class

• Implementing the Runnable interface

• Using the Executor framework

• Calling the start() method directly on a class

What is the purpose of the sleep() method in Java threads?

• Pauses the current thread for a specified time

• Switches the current thread to a waiting state

• Stops the current thread permanently

• Releases the lock on the current thread

What is the significance of the join() method in Java?

• It combines two or more threads into a single thread

• It waits for a thread to complete its execution

• It synchronizes access to shared resources

• It creates a new thread and adds it to the current thread group

In Java, what is the purpose of the volatile keyword in multithreading?

• It ensures that a thread runs faster

• It prevents a variable from being modified by multiple threads

• It forces a thread to wait before accessing a critical section

• It indicates that a variable may be modified asynchronously by multiple threads

What is a race condition in the context of multithreading?

• A condition when two threads compete to access a shared resource and the outcome depends on the relative time of their execution

• A condition when multiple threads are stuck waiting for each other to complete

• A condition when multiple threads accidentally deadlock due to improper synchronization

• A condition when multiple threads execute in a synchronized manner

Which method is used to explicitly stop a thread's execution in Java?

• stop()

• exit()

• break()

• interrupt()

What is the default priority of a thread in Java?

• 0

• 1

• 5

• 10

What does the wait() method in Java do?

• Pauses the current thread indefinitely until notified

• Terminates the current thread and frees up resources

• Sleeps the current thread for a specified amount of time

• Halts the current thread and releases its locks