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How to interrupt a running Thread in Java
Problem Description
How to interrupt a running Thread?
Solution
Following example demonstrates how to interrupt a running thread interrupt() method of thread and check if a thread is interrupted using isInterrupted() method.
public class GeneralInterrupt extends Object implements Runnable { public void run() { try { System.out.println("in run() - about to work2()"); work2(); System.out.println("in run() - back from work2()"); } catch (InterruptedException x) { System.out.println("in run() - interrupted in work2()"); return; } System.out.println("in run() - doing stuff after nap"); System.out.println("in run() - leaving normally"); } public void work2() throws InterruptedException { while (true) { if (Thread.currentThread().isInterrupted()) { System.out.println("C isInterrupted()="+ Thread.currentThread().isInterrupted()); Thread.sleep(2000); System.out.println("D isInterrupted()="+ Thread.currentThread().isInterrupted()); } } } public void work() throws InterruptedException { while (true) { for (int i = 0; i < 100000; i++) { int j = i * 2; } System.out.println("A isInterrupted()="+ Thread.currentThread().isInterrupted()); if (Thread.interrupted()) { System.out.println("B isInterrupted()="+ Thread.currentThread().isInterrupted()); throw new InterruptedException(); } } } public static void main(String[] args) { GeneralInterrupt si = new GeneralInterrupt(); Thread t = new Thread(si); t.start(); try { Thread.sleep(2000); } catch (InterruptedException x) { } System.out.println("in main() - interrupting other thread"); t.interrupt(); System.out.println("in main() - leaving"); } }
Result
The above code sample will produce the following result.
in run() - about to work2() in main() - interrupting other thread in main() - leaving C isInterrupted() = true in run() - interrupted in work2()
java_threading.htm
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