How to terminate a thread in java

How do you destroy a thread?

There is no way to gracefully kill a thread. Generally you don’t kill, stop, or interrupt a thread (or check wheter it is interrupted()), but let it terminate naturally. It is simple. You can use any loop together with (volatile) boolean variable inside run() method to control thread’s activity.

How do you stop a thread in Java 8?

If you really need to stop a Thread the hard way you may consider that the method Thread. stop() (without providing an arbitrary Throwable ) still works with Java 8. It will generate a ThreadDeath on the stopped thread which can be handled like any other Error , despite its unusual name.

How do you kill a blocked thread in Java?

Thread. interrupt() will not interrupt a thread blocked on a socket. You can try to call Thread. stop() or Thread.

Can we call run method twice?

The run method is called twice. One call is by calling start() in the MyRunnable constructor; this is executed in the separate thread. … However, you also call run directly in main , which is executed in the main thread.

What happens if we start a thread twice?

After starting a thread, it can never be started again. If you does so, an IllegalThreadStateException is thrown. In such case, thread will run once but for second time, it will throw exception.

How do I stop the ExecutorService thread?


  1. If using Thread directly in your code, you may call interrupt() on the instance of thread.
  2. If using Executor framework, you may cancel each task by calling cancel() on Future.
  3. If using Executor framework, you may shutdown the ExecutorService by calling the shutdownNow() method.
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How do I know if a thread is running?

Use Thread. currentThread(). isAlive() to see if the thread is alive[output should be true] which means thread is still running the code inside the run() method or use Thread.14 мая 2009 г.

How do I stop runnable?

Manage your thread creation within a threadpool, and use Future. cancel() to kill the running thread: ExecutorService executorService = Executors. newSingleThreadExecutor(); Runnable longRunningTask = new Runnable(); // submit task to threadpool: Future longRunningTaskFuture = executorService.

What is thread blocking?

Blocked means execution gets stuck there; generally, the thread is put to sleep by the system and yields the processor to another thread. When a thread is blocked trying to acquire a mutex, execution resumes when the mutex is released, though the thread might block again if another thread grabs the mutex before it can.

What is a blocking method?

Blocking methods in Java are those methods which block the executing thread until their operation finished. A famous example of blocking method is InputStream read() method which blocks until all data from InputStream has been read completely.

What is blocked thread in Java?

In the BLOCKED state, a thread is about to enter a synchronized block, but there is another thread currently running inside a synchronized block on the same object. The first thread must then wait for the second thread to exit its block. In the WAITING state, a thread is waiting for a signal from another thread.

Can we start a dead thread in Java?

So there is no way to bring back the dead thread to runnable state,instead you should create a new Thread instance. It is never legal to start a thread more than once. In particular, a thread may not be restarted once it has completed execution. You’ll have to start a brand new instance.

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Can we directly call run method?

No, you can not directly call run method to start a thread. You need to call start method to create a new thread. If you call run method directly , it won’t create a new thread and it will be in same stack as main. As you can see when we are directly calling run method, it is not creating new threads.

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