Java Example - Check if a thread is alive

The following example demonstrates how to detect whether a thread is alive by inheriting the Thread class and using the currentThread() method:

/*
 author by w3cschool.cc
 TwoThreadAlive.java
 */public class TwoThreadAlive extends Thread {
   public void run() {
      for (int i = 0; i < 10; i++) {
         printMsg();
      }
   }

   public void printMsg() {
      Thread t = Thread.currentThread();
      String name = t.getName();
      System.out.println("name=" + name);
   }

   public static void main(String[] args) {
      TwoThreadAlive tt = new TwoThreadAlive();
      tt.setName("Thread");
      System.out.println("before start(), tt.isAlive()=" + tt.isAlive());
      tt.start();
      System.out.println("just after start(), tt.isAlive()=" + tt.isAlive());
      for (int i = 0; i < 10; i++) {
         tt.printMsg();
      }
      System.out.println("The end of main(), tt.isAlive()=" + tt.isAlive());
   }}

The output result of the above code is:

before start(), tt.isAlive()=falsejust after start(), tt.isAlive()=truename=main
name=Threadname=main
name=main
name=main
name=main
name=main
name=main
name=main
name=main
name=main
name=Threadname=Threadname=Threadname=Threadname=ThreadThe end of main(), tt.isAlive()=truename=Threadname=Threadname=Threadname=Thread

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