Java Thread and I/O Quiz

Which of the following is the correct way to create a thread in Java?

• Extending the Thread class

• Implementing Runnable interface

• Both a and b

• None of the above

What method must be overridden when implementing the Runnable interface?

• start()

• stop()

• run()

• init()

Which method is used to start a thread execution?

• run()

• start()

• execute()

• initialize()

What is the purpose of the synchronized keyword?

• To speed up thread execution

• To prevent thread execution

• To control access to critical sections

• To terminate threads

Which of the following are ways to synchronize a block of code?

• synchronized method

• synchronized statement

• synchronized object

• Both a and b

What is a critical section?

• Part of the code where memory is freed

• Part of code accessed by multiple threads

• A section used only once

• None of the above

Which of the following is used for inter-thread communication?

• notify()

• wait()

• notifyAll()

• All of the above

What happens if wait() is called without owning the object's lock?

• Nothing

• Compilation error

• IllegalMonitorStateException

• Thread dies

What causes a deadlock?

• Infinite loop

• Threads waiting on each other's resources

• Improper variable declaration

• Stack overflow

Which class provides built-in methods for thread communication?

• Thread

• Runnable

• Object

• System