clock.java

来自「Java程序设计技巧与开发实例附书源代码。」· Java 代码 · 共 47 行

import java.awt.Label;
import java.util.Date;

public class Clock
        extends Label
        implements Runnable
{
    private Thread clocker = null;

    public Clock()
    {
        setText(new Date().toString());
    }

    public void start()
    {
        if (clocker == null)
        {
            clocker = new Thread(this);
            clocker.start();
        }
    }

    public void stop()
    {
        clocker = null;
    }

    public void run()
    {
        Thread currentThread = Thread.currentThread();
        while (clocker == currentThread)
        {
            setText(new Date().toString());
            try
            {
                clocker.sleep(1000);
            }
            catch (InterruptedException ie)
            {
                setText("Clock broken");
            }
        }
    }
}