Java Examples - Interrupt a Thread

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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()


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