final boolean isAlive (): call this method when thread is still alive, it will return true, otherwise return false

DemoJoin

public class DemoJoin { 
  public static void main (String args []) { 
  NewThread ob [] = {new NewThread ("One"), new NewThread ("Two"), new NewThread ("Three")}; 
  for (int i = 0; i <3; i ++) 
  System.out.println ("Thread" + ob [i] .name + "is alive:" + ob [i] .t.isAlive ()); 
  try { 
  System.out.println ("Waiting for threads to finish."); 
  ob [0] .t.join (); 
  ob [1] .t.join (); 
  ob [2] .t.join (); 
  } Catch (InterruptedException e) { 
  // TODO: handle exception 
  System.out.println ("Main thread Interrupted"); 
  } 
  for (int i = 0; i <3; i ++) 
  System.out.println ("Thread" + ob [i] .name + "is alive:" + ob [i] .t.isAlive ()); 
  System.out.println ("Main thread exiting."); 
  } 
  }