An example for join(long milliseconds).

package com.tutorials.threading;
 
public class WaitForMSToJoinExample implements Runnable {
               public static void main(String[] args) throws InterruptedException {
                              WaitForMSToJoinExample myObj = new WaitForMSToJoinExample();
                              Thread MyThreadObj = new Thread(myObj, "Child Thread");
                              MyThreadObj.start();
                              System.out.println("Main thread will wait for the other thread.");
                              MyThreadObj.join(2000);
                              System.out.println("Main thread exited after 2 sec.");
               }
 
               @Override
               public void run() {
                              try {
                                             Thread.sleep(5000);
                                             System.out.println(Thread.currentThread().getName()
                                                                           + " completed now.");
                              } catch (InterruptedException e) {
                                             e.printStackTrace();
                              }
               }
}