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Java Multithreading MCQ - Multiple Choice Questions And Answers | JavaInUse

Java Multithreading MCQ - Multiple Choice Questions And Answers

Q. What is multithreading in Java?

A. It refers to a technique in which a single thread is executed multiple times in a loop.
B. It refers to a technique in which multiple threads are executed concurrently to improve performance.
C. It refers to a technique in which a thread is used to create multiple instances of a class.
D. It refers to a technique in which a thread is used to synchronize multiple objects.

Q. Which keyword is used to create a thread in Java?

A. new
B. class
C. thread
D. start

Q. Which method is used to start a thread in Java?

A. run()
B. start()
C. execute()
D. begin()

Q. What is the difference between Thread.sleep() and Object.wait() methods in Java?

A. Thread.sleep() is used to pause the execution of the current thread, while Object.wait() is used to suspend a thread until notified or interrupted.
B. Thread.sleep() is used to suspend a thread until notified or interrupted, while Object.wait() is used to pause the execution of the current thread.
C. Thread.sleep() can only be called on the main thread, while Object.wait() can be called on any thread.
D. There is no difference between Thread.sleep() and Object.wait() methods.

Q. How can you prevent multiple threads from accessing a shared resource simultaneously in Java?

A. By using synchronized keyword
B. By using volatile keyword
C. By using atomic variables
D. All of the above

Q. What is the purpose of the join() method in Java?

A. To pause the execution of the current thread
B. To join two or more threads together
C. To wait for a thread to complete its execution
D. To terminate a thread

Q. What is deadlock in multithreading?

A. It occurs when two or more threads are waiting for each other to release resources and none of them can proceed.
B. It occurs when a thread enters an infinite loop and never terminates.
C. It occurs when multiple threads try to access a shared resource simultaneously and cause data corruption.
D. It occurs when a thread calls the wait() method and waits indefinitely for a notify() or notifyAll() call.

Q. Which method is used to interrupt a thread in Java?

A. sleep()
B. interrupt()
C. stop()
D. break()

Q. What is the purpose of the yield() method in Java?

A. To pause the execution of the current thread
B. To make the current thread sleep for a specific duration
C. To transfer the CPU control to another thread of the same priority
D. To terminate the current thread

Q. What is the purpose of the isAlive() method in Java?

A. To check if a thread is currently running
B. To check if a thread is alive or dead
C. To check if a thread is in a sleep state
D. To check if a thread is waiting for a lock or monitor

Q. Which of the following is true about Java multithreading?

A. 
Java multithreading allows multiple threads to execute simultaneously on a single processor.
B. 
Java multithreading allows only one thread to execute at a time on a single processor.
C. 
Java multithreading is not supported in the Java programming language.
D. 
Java multithreading allows multiple threads to execute simultaneously on multiple processors.





Q. What is the correct way to create a new thread in Java?

A. 
Thread myThread = new Thread();
myThread.start();
B. 
MyThread myThread = new MyThread();
myThread.run();
C. 
Thread myThread = Thread.create();
myThread.run();
D. 
MyThread myThread = new MyThread();
myThread.start();

Q. Which of the following methods is used to acquire a lock on an object in Java?

A. 
Object.wait()
B. 
Thread.sleep()
C. 
Object.lock()
D. 
synchronized

Q. What is the purpose of the wait() and notify() methods in Java?

A. 
The wait() method is used to make a thread wait for a condition to be satisfied, and the notify() method is used to wake up a thread that is waiting for a condition.
B. 
The wait() method is used to terminate a thread, and the notify() method is used to start a thread.
C. 
The wait() method is used to pause the execution of a thread for a specified amount of time, and the notify() method is used to resume the execution of a paused thread.
D. 
The wait() and notify() methods are used to synchronize access to shared resources between multiple threads.

Q. What is the purpose of the join() method in Java?

A. 
The join() method is used to terminate a thread.
B. 
The join() method is used to wait for a thread to complete its execution.
C. 
The join() method is used to synchronize access to shared resources between multiple threads.
D. 
The join() method is used to pause the execution of a thread for a specified amount of time.

Q. What is the output of the following code snippet?

class MyRunnable implements Runnable {
    public void run() {
        System.out.println("Hello, World!");
    }
}

public class Main {
    public static void main(String[] args) {
        Thread myThread = new Thread(new MyRunnable());
        myThread.start();
    }
}
A. 
Hello, World!
B. 
Hello
C. 
World
D. 
The code will not compile due to errors.

Q. What happens when two threads try to update the same variable simultaneously without synchronization?

A. 
The variable's value will always be updated correctly without any issues.
B. 
One of the threads will update the variable's value and the other thread's update will be lost.
C. 
The threads will take turns updating the variable's value in a synchronized manner.
D. 
The behavior is unpredictable and can result in inconsistent or incorrect values.

Q. Which of the following is an advantage of using threads in Java?

A. 
Threads allow for concurrent execution, which can improve performance by utilizing multiple processors or processor cores.
B. 
Threads can be used to create parallel programs that can execute tasks simultaneously.
C. 
Threads can simplify the design and implementation of certain types of programs, such as event-driven applications.
D. 
All of the above.

Q. What is a deadlock in multithreading?

A. 
A deadlock occurs when a thread is blocked and unable to proceed because it is waiting for a resource held by another thread, while the other thread is also waiting for a resource held by the first thread.
B. 
A deadlock occurs when a thread is terminated unexpectedly, resulting in the termination of the entire application.
C. 
A deadlock occurs when multiple threads are executing simultaneously and interfere with each other's execution, resulting in unpredictable output or errors.
D. 
A deadlock occurs when a thread is able to execute multiple tasks simultaneously, resulting in improved performance.

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