Java Threads Quiz

The run() method is crucial for executing the code in a separate thread. It defines the task that the thread will perform when started, allowing concurrent execution of code.

To create a thread in Java, you must extend the java.lang.Thread class. This allows you to override the run() method, which contains the code that will be executed when the thread is started.

A thread is in the 'New' state after it has been created but not yet started. It transitions to 'Runnable' when it is ready to run, but until then, it remains in the 'New' state.

When a thread's run() method completes, it cannot be restarted and is considered dead. This means it has finished its execution and cannot be reused, which is why the correct answer is that the thread is considered dead.

The correct method to start a thread in programming is 'start()'. This method initializes the thread and invokes the 'run()' method in a new thread of execution, allowing concurrent operations.

The thread scheduler's primary role is to decide which thread runs at any moment, ensuring efficient CPU utilization and responsiveness. While it can manage thread states and create or terminate threads, its main function is scheduling.

The correct answer is 'Active' because it is not a recognized state of a thread. The valid states include 'Running', 'New', and 'Runnable', which describe the lifecycle of a thread in programming.

The synchronized keyword in Java ensures that only one thread can access a block of code or method at a time, thus controlling the order of thread execution and preventing thread interference.

The correct method to wait for a thread to finish is 'join()'. This method blocks the calling thread until the thread whose join() method is called has completed its execution, ensuring proper synchronization.

Race conditions occur when multiple threads access shared data simultaneously, leading to unpredictable results. This is a significant problem in concurrent programming, making 'race conditions' the correct answer.