public class ThreadTest extends Thread {  
private int count = 10;

    @Override

    public void run() {                          //重写run()方法

        while (true) {

            System.err.print(count + " ");       //打印count变量

            if (--count == 0) {                  //count自减，等于0退出循环

                return;

            }

        }

    }

    public static void main(String[] args) {

        new ThreadTest().start();

    }
}