currenttime.java

用Java做的一个学生考试分析程序

/*
 * CurrentTime.java
 *
 * Created on 2007年11月29日, 下午10:28
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package 考试成绩分析程序;
import java.awt.Graphics;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/**
 *显示当前时间类
 * @author drawen
 */
public class CurrentTime extends JFrame {
    Clock clock=new Clock();
    JLabel text=new JLabel();
    /** Creates a new instance of CurrentTime */
    public CurrentTime(String string) {
        super(string);
        JPanel jpanel=new JPanel(new GridLayout(0,5));
        jpanel.add(new JLabel());
        jpanel.add(new JLabel());
        jpanel.add(text);        
        new Thread(clock).start();
        add(jpanel,BorderLayout.NORTH);
        add(clock,BorderLayout.CENTER);        
    }
    class Clock extends JPanel implements Runnable{
        private int hour,minute,second;
        Clock(){
            getCurrentTime();
            repaint();
        }
        public void run(){
            while(true){
                try{                    
                    clock.updateTime();
                    text.setText((clock.hour>12?"下午":"上午")+clock.hour%12+":"+clock.minute+":"+clock.second);
                    Thread.sleep(1000);
                }catch(InterruptedException e){}
            }
        }
        public void getCurrentTime(){
            long intervals=(System.currentTimeMillis())/1000;
            second=(int)intervals%60;
            intervals/=60;
            minute=(int)intervals%60;
            intervals/=60;
            hour=(int)(intervals+8)%24;     
        }        
        protected void paintComponent(Graphics g){
            super.paintComponent(g);
            int x,y,rudius;
            x=getWidth()/2;
            y=getHeight()/2;
            g.fillOval(x-5,y-5,10,10);
            rudius=(int)(Math.min(x,y)*0.8);
            g.drawOval(x-rudius,y-rudius,2*rudius,2*rudius);
            g.drawString("12",x-5,y-rudius+15);
            g.drawString("6",x-3,y+rudius-5);
            g.drawString("3",x+rudius-10,y+5);
            g.drawString("9",x-rudius+5,y+5);
        
            int mLength=(int)(rudius*0.6);
            g.drawLine(x,y,x+(int)(Math.sin(Math.PI/30*(minute+second/60.0))*mLength),
                y-(int)(Math.cos(Math.PI/30*minute)*mLength));
        
            int hLength=(int)(rudius*0.4);
            g.drawLine(x,y,x+(int)(Math.sin(Math.PI/6*(hour%12+minute/60.0))*hLength),
                y-(int)(Math.cos(Math.PI/6*(hour%12+minute/60.0))*hLength));
        
            int sLength=(int)(rudius*0.8);
            g.drawLine(x,y,x+(int)(Math.sin(Math.PI/30*second)*sLength),
                y-(int)(Math.cos(Math.PI/30*second)*sLength));        
        }   
        public void updateTime(){
            getCurrentTime();
            repaint();
        }
    }
}