Java Thread interrupted() Method

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Description

The Java Thread interrupted() method interrupts this thread. Tests whether the current thread has been interrupted.

If this method were to be called twice in succession, the second call would return false (unless the current thread were interrupted again, after the first call had cleared its interrupted status and before the second call had examined it).

Declaration

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

public static boolean interrupted()

Parameters

NA

Return Value

This method returns true if the current thread has been interrupted; false otherwise.

Exception

NA

Example: Checking if thread is interrupted

The following example shows the usage of Java Thread interrupted() method. In this program, we've created a thread class ThreadDemo by implementing Runnable interface. In constructor, a new thread is created using new Thread. Its name is printed using getName() and using start() method, thread is started. Using interrupted() method, we're checking if thread is not interrupted then interrupt the thread using interrupt() method. Thereafter we block the thread using join() method. In run() method, we added a sleep of 1 second in while(true) loop, which causes an InterruptedException.

In main method, we've created two threads of ThreadDemo.

package com.tutorialspoint;

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();
        
      // tests whether this thread has been interrupted
      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();
   }
} 

Output

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