class ChildThread extends Thread {
    private String name;
    ChildThread(String name){
      this.name = name;
    }

    public void run(){
      for(int i=0; i<10; i++){
        System.out.println(name+"******i="i);
      }
    }

  }

  class DemoThread {
    public static void main(String[] args){
      ChildThread childThread1 = new ChildThread("子线程1")；
      ChildThread childThread2 = new ChildThread("子线程2")；

      childThread1.start();
      childThread2.start();
    }
  }