class DelayThread exends Thread { private static int count=0; private int no; private int delay; public DelayThread(){ count++; no=count; } public void run(){ try{ for (int i=0;i<10;i++){ delay=(int)(Math.random()*5000); sleep(delay); System.out.println(“线程”+no+“ 的延迟时间是 ”+delay); } }catch(InterruptedException e){} } } public class MyThread{ public static void main(String args[]){ DelayThread thread1=new DelayThread(); DelayThread thread2=new DelayThread(); thread1.start(); thread2.start(); try{ Thread.sleep(1000);} catch(InterruptedException e){ System.out.println(“线程出错！”); } } } 运用Java将上列程序利用Runnable接口改写，并上机检验。

下面是使用Runnable接口改写后的代码：

class DelayRunnable implements Runnable {
  private static int count = 0;
  private int no;
  private int delay;
  
  public DelayRunnable() {
    count++;
    no = count;
  }
  
  public void run() {
    try {
      for (int i = 0; i < 10; i++) {
        delay = (int) (Math.random() * 5000);
        Thread.sleep(delay);
        System.out.println("线程" + no + " 的延迟时间是 " + delay);
      }
    } catch (InterruptedException e) {}
  }
}

public class MyThread {
  public static void main(String args[]) {
    Thread thread1 = new Thread(new DelayRunnable());
    Thread thread2 = new Thread(new DelayRunnable());
    thread1.start();
    thread2.start();
    try {
      Thread.sleep(1000);
    } catch (InterruptedException e) {
      System.out.println("线程出错！");
    }
  }
}

这个程序与之前的程序功能相同，只是将DelayThread类改为了DelayRunnable类，并且使用Thread类的构造函数来创建线程。可以运行该程序进行检验。