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