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import java.awt.*;
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import java.applet.Applet;
import java.util.Calendar;
import java.text.SimpleDateFormat;
import java.util.Date;
public class ClockApplet extends Applet implements Runnable //Applet支持线程
{
private Thread athread; //线程
private SimpleDateFormat sdateformat; //日期格式
public void init()
{
this.setBackground(Color.white);//背景颜色设为白色
this.athread = null;
}
public void paint(Graphics g)
{
this.sdateformat = new SimpleDateFormat("hh时mm分ss秒");
g.drawString(this.sdateformat.format(new Date()),25,131);
Calendar rightnow = Calendar.getInstance();
int second = rightnow.get(Calendar.SECOND);
int minute = rightnow.get(Calendar.MINUTE);
int hour = rightnow.get(Calendar.HOUR);
//半径
int R_H = 20,R_M = 4,R_S = 4;
//时针的坐标
//x ====(9-3)[0-6] (3-9)[6-0]
//y ====(12-6)[0-6] (6-12)[6-0]
int H_x ;
int H_y;
//x
if(hour == 0)
{
hour = 12;
}
if( hour = 3 hour = 9 )
{
H_x = R_H*Math.abs(hour - 9);
}
else
{
if(hour 9)
{
H_x = R_H*Math.abs(hour - 9);
}
else
{
H_x = R_H*Math.abs(hour+3);
}
}
//y
if( hour = 6 hour = 12 )
{
H_y = R_H*Math.abs(hour - 12);
}
else
{
H_y = R_H*hour;
}
//分针的坐标
int M_x;
int M_y;
if(minute == 0)
{
minute = 60;
}
if( minute = 15 minute = 45 )
{
M_x = R_M*Math.abs(minute - 45);
}
else
{
if(minute 45)
{
M_x = R_M*Math.abs(minute - 45);
}
else
{
M_x = R_M*Math.abs(minute+15);
}
}
//y
if( minute = 30 minute 60 )
{
M_y = R_M*Math.abs(minute - 60);
}
else
{
M_y = R_M*minute;
}
//秒针的坐标
int S_x;
int S_y;
if(second == 0)
{
second = 60;
}
if( second = 15 second = 45 )
{
S_x = R_S*Math.abs(second - 45);
}
else
{
if(second 45)
{
S_x = R_S*Math.abs(second - 45);
}
else
{
S_x = R_S*Math.abs(second+15);
}
}
//y
if( second = 30 second = 60 )
{
S_y = R_S*Math.abs(second - 60);
}
else
{
S_y = R_S*second;
}
// g.drawString(String.valueOf(second),25,50);
// g.drawString(String.valueOf(minute),25,60);
// g.drawString(String.valueOf(hour),25,70);
// g.drawString(String.valueOf(H_x),25,80);
// g.drawString(String.valueOf(H_y),25,90);
g.drawOval(0,0,120,120);//距离相差10像素
g.setColor(Color.darkGray);
g.drawString("9",5,65);
g.drawString("3",110,65);
g.drawString("12",55,15);
g.drawString("6",55,115);
g.drawString("1",80,20);
g.drawString("2",100,40);
g.drawString("4",100,90);
g.drawString("5",80,110);
g.drawString("7",30,110);
g.drawString("8",10,90);
g.drawString("10",10,40);
g.drawString("11",30,20);
g.setColor(Color.red);
g.drawLine(60,60,H_x,H_y);//前一个点表示起点，另一个表示终点
g.setColor(Color.blue);
g.drawLine(60,60,M_x,M_y);
g.setColor(Color.yellow);
g.drawLine(60,60,S_x,S_y);
}
public void start()
{
if(athread == null)
{
athread = new Thread(this);
athread.start();
}
}
public void stop()
{
if(athread != null)
{
athread.interrupt();
athread = null;
}
}
public void run()
{
while(athread != null)
{
repaint();
try
{
athread.sleep(1000);
}
catch(InterruptedException e)
{
}
}
}
}
这里有书上源码一篇，可以参考。
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.Calendar;
import javax.swing.*;
public class Clock extends JPanel implements ActionListener
{
// 创建时钟的外形
protected static Ellipse2D face = new Ellipse2D.Float(3, 3, 94, 94);
// 创建时钟的标记
protected static GeneralPath tick = new GeneralPath();
static
{
tick.moveTo(100, 100);
tick.moveTo(49, 0);
tick.lineTo(51, 0);
tick.lineTo(51, 6);
tick.lineTo(49, 6);
tick.lineTo(49, 0);
}
// 创建时针
protected static GeneralPath hourHand = new GeneralPath();
static
{
hourHand.moveTo(50, 15);
hourHand.lineTo(53, 50);
hourHand.lineTo(50, 53);
hourHand.lineTo(47, 50);
hourHand.lineTo(50, 15);
}
// 创建分针
protected static GeneralPath minuteHand = new GeneralPath();
static
{
minuteHand.moveTo(50, 2);
minuteHand.lineTo(53, 50);
minuteHand.lineTo(50, 58);
minuteHand.lineTo(47, 50);
minuteHand.lineTo(50, 2);
}
// 创建秒针
protected static GeneralPath secondHand = new GeneralPath();
static
{
secondHand.moveTo(49, 5);
secondHand.lineTo(51, 5);
secondHand.lineTo(51, 62);
secondHand.lineTo(49, 62);
secondHand.lineTo(49, 5);
}
// 设置时钟的颜色
protected static Color faceColor = new Color(220, 220, 220);
protected static Color hourColor = Color.red.darker();
protected static Color minuteColor = Color.blue.darker();
protected static Color secondColor = new Color(180, 180, 0);
protected static Color pinColor = Color.gray.brighter();
// 创建时钟的枢纽
protected Ellipse2D pivot = new Ellipse2D.Float(47, 47, 6, 6);
protected Ellipse2D centerPin = new Ellipse2D.Float(49, 49, 2, 2);
// 创建绕时钟枢纽转的变换
protected AffineTransform hourTransform =
AffineTransform.getRotateInstance(0, 50, 50);
protected AffineTransform minuteTransform =
AffineTransform.getRotateInstance(0, 50, 50);
protected AffineTransform secondTransform =
AffineTransform.getRotateInstance(0, 50, 50);
// 创建每秒触发一次的Timer
protected Timer timer = new Timer(1000, this);
protected Calendar calendar = Calendar.getInstance();
public Clock()
{
setPreferredSize(new Dimension(100, 100));
}
// 当plane加入container中时发生
public void addNotify()
{
super.addNotify();
timer.start();
}
// 当plane从container中移处时发生
public void removeNotify()
{
timer.stop();
super.removeNotify();
}
public void actionPerformed(ActionEvent event)
{
// 更新calender的时间
this.calendar.setTime(new java.util.Date());
int hours = this.calendar.get(Calendar.HOUR);
int minutes = this.calendar.get(Calendar.MINUTE);
int seconds = this.calendar.get(Calendar.SECOND);
//设置变换，使得时针、分针、秒针各自按绕枢纽旋转一定的角度
hourTransform.setToRotation(((double) hours) *
(Math.PI / 6.0), 50, 50);
minuteTransform.setToRotation(((double) minutes) *
(Math.PI / 30.0), 50, 50);
secondTransform.setToRotation(((double) seconds) *
(Math.PI / 30.0), 50, 50);
repaint();
}
public void paint(Graphics g)
{
super.paint(g);
// 得到图形上下文和抗锯齿处理
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(faceColor);
g2.fill(face);
g2.setPaint(Color.black);
g2.draw(face);
// 产生钟面上12个滴答位置
for (double p = 0.0; p 12.0; p += 1.0)
{
//利用变换画出同心的滴答的标线
g2.fill(tick.createTransformedShape(
AffineTransform.getRotateInstance((Math.PI / 6.0) * p,
50, 50)));
}
g2.setPaint(hourColor);
g2.fill(hourHand.createTransformedShape(hourTransform));
g2.setPaint(minuteColor);
g2.fill(minuteHand.createTransformedShape(minuteTransform));
g2.setPaint(secondColor);
g2.fill(secondHand.createTransformedShape(secondTransform));
g2.fill(pivot);
g2.setPaint(pinColor);
g2.fill(centerPin);
}
public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.setLocation(700, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new Clock());
frame.pack();
frame.show();
}
}
面向对象思想写成：
下面是一个显示器类
public class Display {
private int value;//现在的值
private int limit;//上限值
Display( int limit) {
this.limit = limit;
}
public void increase() {
value++;
if(value == limit) {
value = 0;
}
}
public int getValue() {
return value;
}
public static void main(String[] args) {
Display d = new Display(24);
for(;;) {
d.increase();
System.out.println(d.getValue());
}
}
}
下面创建一个时钟对象：
public class Clock {
private Display h = new Display(24);
private Display min = new Display(60);
private Display s = new Display(60);
public void start () {
for(;;) {
s.increase();
if(s.getValue() == 0){//如果分重置，小时+1
min.increase();
if(min.getValue() == 0){//如果分重置，小时+1
h.increase();
}
}
System.out.printf("%02d:%02d:%02d\n",h.getValue(), min.getValue(),s.getValue());//格式输出
}
}
public static void main(String[] args) {
Clock clock = new Clock();
clock.start();
}