Java编程小实例—数字时钟的实现代码示例

2021-01-24 11:30java妞妞 JAVA教程

正所谓拳不离手曲不离口，java学习的过程中，练习还是要多一点比较好。接下来分享给大家一个Java编程的小实例，供朋友们参考。

本文的实例是Java编程实现一个数字时钟，代码测试可用，练练手吧。代码如下：

									package me.socketthread;

									import java.awt.Color;

									import java.awt.Dimension;

									import java.awt.Font;

									import java.awt.Graphics;

									import java.awt.Graphics2D;

									import java.util.Calendar;

									import java.util.GregorianCalendar;

									import javax.swing.JFrame;

									//数字时钟

									public class ClockDemo extends JFrame implements Runnable{

									    Thread clock;

									    public ClockDemo(){

									        super("数字时钟");

									        //调用父类构造函数

									        setFont(new Font("Times New Roman",Font.BOLD,60));

									        //设置时钟的显示字体

									        start();

									        //开始进程

									        setSize(280,100);

									        //设置窗口尺寸

									        setVisible(true);

									        //窗口可视

									        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

									        //关闭窗口时退出程序

									    }

									    public void start(){

									        //开始进程

									        if (clock==null){

									            //如果进程为空值

									            clock=new Thread(this);

									            //实例化进程

									            clock.start();

									            //开始进程

									        }

									    }

									    public void run(){

									        //运行进程

									        while (clock!=null){

									            repaint();

									            //调用paint方法重绘界面

									            try{

									                Thread.sleep(1000);

									                //线程暂停一秒(1000毫秒)

									            }

									            catch (InterruptedException ex){

									                ex.printStackTrace();

									                //输出出错信息

									            }

									        }

									    }

									    public void stop(){

									        //停止进程

									        clock=null;

									    }

									    public void paint(Graphics g){

									        //重载组件的paint方法

									        Graphics2D g2=(Graphics2D)g;

									        //得到Graphics2D对象

									        Calendar now=new GregorianCalendar();

									        //实例化日历对象

									        String timeInfo="";

									        //输出信息

									        int hour=now.get(Calendar.HOUR_OF_DAY);

									        //得到小时数

									        int minute=now.get(Calendar.MINUTE);

									        //得到分数

									        int second=now.get(Calendar.SECOND);

									        //得到秒数

									        if (hour<=9)

									        timeInfo+="0"+hour+":";

									        //格式化输出 else

									        timeInfo+=hour+":";

									        if (minute<=9)

									        timeInfo+="0"+minute+":"; else

									        timeInfo+=minute+":";

									        if (second<=9)

									        timeInfo+="0"+second; else

									        timeInfo+=second;

									        g.setColor(Color.white);

									        //设置当前颜色为白色

									        Dimension dim=getSize();

									        //得到窗口尺寸

									        g.fillRect(0,0,dim.width,dim.height);

									        //填充背景色为白色

									        g.setColor(Color.orange);

									        //设置当前颜色为橙色

									        g.drawString(timeInfo,20,80);

									        //显示时间字符串

									    }

									    public static void main(String[] args){

									        new ClockDemo();

									    }

									}