java线程模拟

package runnableTest;

public class ThreadDemo extends Thread{
    private Thread t;
    private String threadName;

    public ThreadDemo(String name) {
        threadName = name;
        System.out.println("第一步：createing:" + name);
    }

    public void run() {
        System.out.println("第三步：runing:" + threadName);
       try {
           for (int i = 5;i > 0; i--) {
               System.out.println("Thread:" + threadName + ", " + i);
               if (threadName.equals("线程名称二")) {
                   Thread.sleep(5000);
               }
           }
       }catch (InterruptedException e){
           System.out.println("Thread " +  threadName + " interrupted.");
       }
        System.out.println("Thread " +  threadName + " exiting.");
    }

    public void start() {
        System.out.println("第二步：starting:" + threadName);
        if (t == null) {
            t = new Thread(this, threadName);
            t.start();
        }
    }

}

调用这个类

package runnableTest;

public class TestThread2 {
    public static void main(String[] args){
        ThreadDemo T1 = new ThreadDemo("线程名称一");
        T1.start();
        ThreadDemo T2 = new ThreadDemo("线程名称二");
        T2.start();
    }
}