join

package com.fly.syn.c1;

public class Test1 {
    
    public static void main(String[] args) throws Exception {
             
      Thread a =      new ThreadA();
      a.start();
      a.join();
      System.out.println("123");
         
    }

}

class ThreadA extends Thread {
    
    @Override
    public void run() {
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("ThreadName = "+Thread.currentThread().getName());
    }
    
}