Creating Thread By Extending Thread Class

Create Thread by Extending Thread:

The second way to create a thread is to create a new class that extends Thread, and then to create an instance of that class.

The extending class must override the run () method, which is the entry point for the new thread. It must also call start () to begin execution of the new thread.

 

Example:

Here is the preceding program rewritten to extend Thread:

// Create a second thread by extending Thread class NewThread extends Thread {    NewThread() {       // Create a new, second thread       super("Demo Thread");       System.out.println("Child thread: " + this);       start(); // Start the thread    }    // This is the entry point for the second thread.    public void run() {       try {          for(int i = 5; i > 0; i--) {             System.out.println("Child Thread: " + i);                                                 // Let the thread sleep for a while.             Thread.sleep(500);          }       } catch (InterruptedException e) {          System.out.println("Child interrupted.");       }       System.out.println("Exiting child thread.");    } } class ExtendThread {    public static void main(String args[]) {       new NewThread(); // create a new thread       try {          for(int i = 5; i > 0; i--) {             System.out.println("Main Thread: " + i);             Thread.sleep(1000);          }       } catch (InterruptedException e) {          System.out.println("Main thread interrupted.");       }       System.out.println("Main thread exiting.");    } }

This would produce following result:

Child thread: Thread[Demo Thread,5,main] Main Thread: 5 Child Thread: 5 Child Thread: 4 Main Thread: 4 Child Thread: 3 Child Thread: 2 Main Thread: 3 Child Thread: 1 Exiting child thread. Main Thread: 2 Main Thread: 1 Main thread exiting.