public class ThreadJoin {

    public static void main(String[]args) throws InterruptedException{

        DemoThread t0 =new DemoThread();
        DemoThread t1 =new DemoThread();
        DemoThread t2 =new DemoThread();
        t0.start();
        t0.join();
        t1.start();
        t2.start();

    }
}

class DemoThread extends Thread{

    public void run(){
        for(int i =0 ;i <5 ;i++){
            System.out.println(this.getName()+":"+i);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}