JAVA GUI 静态时钟

JFrame框架

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import java.awt.*;
import javax.swing.*;
/**
 *
 * @author Administrator
 */
class NewClass extends JFrame {
    public NewClass()
    {
        add(new Jpanell());
    
    }
    
}

Jpanell类

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication31;

import java.awt.*;
import java.util.*;
import javax.swing.*;

public class Jpanell extends JPanel {
    private int hour;
    private int minute;
    private int second;
    private  Calendar a=new GregorianCalendar();
    public Jpanell(){
    this.hour=a.get(Calendar.HOUR_OF_DAY);
    this.minute=a.get(Calendar.MINUTE);
    this.second=a.get(Calendar.SECOND);
    }
    @Override
   protected void paintComponent(Graphics g){
       super.paintComponent(g);
       int w=getWidth()/2;
       int h=getHeight()/2;
       int zhi=Math.min(w, h);
       g.drawOval(w-zhi/2, h-zhi/2, zhi,zhi);
       int shi=(int)(zhi/4);
       int fen=(int)(zhi/2*0.6);
       int miao=(int)(zhi/2*0.8);
       g.drawString("12", w-5,h-zhi/2+10);
       g.drawString("6", w, h+zhi/2);
       g.drawString("9", w-zhi/2+1, h);
       g.drawString("3", w+zhi/2-6, h);
       g.drawLine(w, h,w+(int)(shi*Math.sin((hour+minute/60+second/3600)*2*Math.PI/12)), h-(int)(shi*Math.cos((hour+minute/60+second/3600)*2*Math.PI/12)));//时针
       g.drawLine(w, h, w+(int)(fen*Math.sin((minute+second/60)*2*Math.PI/60)), h-(int)(fen*Math.cos((minute+second/60)*2*Math.PI/60)));//分针
       g.drawLine(w, h, w+(int)(miao*Math.sin((second)*2*Math.PI/60)), h-(int)(miao*Math.cos((second)*2*Math.PI/60)));//秒针
   g.drawString(hour+"："+minute+":"+second+" ", w-30, h+zhi/2+20);
   }
    @Override
   public Dimension getPreferredSize(){
   return new Dimension(100,100);}
}
       
       
     


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测试类

   public static void main(String[] args) {
NewClass xue=new NewClass();
xue.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
xue.setVisible(true);
xue.setTitle("xue");
xue.setSize(500, 500);
xue.setLocation(xue.getWidth()-50, xue.getHeight()-350);
    }
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示例