Java.lang.Thread.interrupt() Method

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Description

The java.lang.Thread.interrupt() method interrupts this thread. Interrupting a thread that is not alive need not have any effect.

Declaration

Following is the declaration for java.lang.Thread.interrupt() method

public void interrupt()

Parameters

  • NA

Return Value

This method does not return any value.

Exception

  • SecurityException -- if the current thread cannot modify this thread.

Example

The following example shows the usage of java.lang.Thread.interrupt() method.

package com.tutorialspoint;

import java.lang.*;

public class ThreadDemo implements Runnable {

   Thread t;

   ThreadDemo() {

      t = new Thread(this);
      System.out.println("Executing " + t.getName());
      // this will call run() fucntion
      t.start();
        
      // interrupt the threads
      if (!t.interrupted()) {
         t.interrupt();
      }
      // block until other threads finish
      try {  
         t.join();
      } catch(InterruptedException e) {}
   }

   public void run() {
      try {       
         while (true) {
            Thread.sleep(1000);
         }
      } catch (InterruptedException e) {
           System.out.print(t.getName() + " interrupted:");
           System.out.println(e.toString());
        }
   }

   public static void main(String args[]) {
     new ThreadDemo();
     new ThreadDemo();
   }
} 

Let us compile and run the above program, this will produce the following result:

Executing Thread-0
Thread-0 interrupted:java.lang.InterruptedException: sleep interrupted
Executing Thread-1
Thread-1 interrupted:java.lang.InterruptedException: sleep interrupted



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