Java Multithreading Mastery Quiz Quiz

1. Thread Creation

   How can you create a thread in Java?

   1. By extending the Object class.
   2. By implementing the Collection interface.
   3. By extending the Thread class or implementing the Runnable interface.
   4. By using the 'create' keyword.
   5. By implementing the Cloneable interface.

2. Thread States

   What are the different states a thread can be in during its lifecycle in Java?

   1. Created, Running, Waiting, Sleeping, Dead
   2. New, Runnable, Blocked, Waiting, Terminated
   3. Active, Idle, Blocked, Suspended, Finished
   4. Born, Alive, Inactive, Destroyed, Gone
   5. Initialized, Executing, Paused, Resumed, Stopped

3. Runnable vs Thread

   What is the key difference between implementing the Runnable interface and extending the Thread class in Java?

   1. Extending Thread allows for multiple inheritance.
   2. Implementing Runnable is faster than extending Thread.
   3. Implementing Runnable allows a class to extend another class, while extending Thread does not.
   4. There is no difference; they are interchangeable.
   5. Extending Thread is preferred for single-threaded applications.

4. Start Method Purpose

   What is the primary purpose of the start() method in the Thread class?

   1. To initialize the thread's name.
   2. To execute the run() method in the current thread.
   3. To allocate memory for the thread.
   4. To begin the thread's execution in a new thread.
   5. To check if the thread is alive.

5. Synchronization Concept

   What does synchronization refer to in the context of Java multithreading?

   1. The process of aligning thread execution speeds.
   2. The mechanism to control the access of multiple threads to shared resources.
   3. The method of distributing tasks evenly among threads.
   4. The technique to monitor thread activity.
   5. The procedure for merging thread outputs.

6. Synchronized Keyword

   How does the synchronized keyword work in Java?

   1. It prevents a thread from being interrupted.
   2. It ensures that only one thread can execute a critical section of code at a time.
   3. It optimizes the thread's performance.
   4. It increases the priority of a thread.
   5. It automatically detects deadlocks.

7. Deadlock Definition

   In Java multithreading, what is a deadlock?

   1. A state where a thread is permanently blocked.
   2. A situation where a thread crashes due to an unhandled exception.
   3. A state where two or more threads are blocked indefinitely, waiting for each other.
   4. A situation where a thread enters an infinite loop.
   5. A state where a thread consumes excessive memory.

8. Thread Communication

   How can threads communicate with each other in Java?

   1. Through direct memory access.
   2. Through shared variables and synchronization mechanisms like wait, notify, and notifyAll.
   3. Through network sockets.
   4. Through external files.
   5. By sending emails.

9. Wait, Notify, NotifyAll

   What is the purpose of the wait(), notify(), and notifyAll() methods in Java?

   1. To control thread priority.
   2. To manage thread pools.
   3. To enable threads to pause execution and signal each other when conditions change.
   4. To terminate threads.
   5. To measure thread execution time.

10. Thread Safety

    What does thread safety mean, and why is it important in Java?

    1. It means a thread is immune to exceptions; it is important for robust applications.
    2. It means multiple threads can access shared resources concurrently without causing data corruption or unexpected behavior; it is important for reliable and predictable multithreaded applications.
    3. It means a thread always terminates gracefully; it is important for system stability.
    4. It means a thread has the highest priority; it is important for critical tasks.
    5. It means a thread consumes minimal resources; it is important for efficient resource utilization.