import java.awt.*;
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import java.awt.event.*;
import javax.swing.*;
import sun.util.calendar.Gregorian;
import java.util.Calendar;
import java.util.GregorianCalendar;
public class ClockPointer extends JFrame{
int x, y, x0, y0, r, h, olds_x, olds_y, oldm_x, oldm_y, oldh_x, oldh_y,
ss,mm, hh, old_m, old_h, ang;
final double RAD = Math.PI/180;
public ClockPointer(){
super("Java时钟");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Image image = getToolkit().getImage("clock.gif");
setIconImage(image);
setSize(400,400);
setBackground(Color.white);
//setLocation(300,150);
this.setLocationRelativeTo(null);
setResizable(true);
int delay = 1000;
//创建一个监听事件
setVisible(true);
ActionListener drawClock = new ActionListener(){
public void actionPerformed(ActionEvent evt){
repaint();
}
};
//创建一个时间计数器，每一秒触发一次
new Timer(delay, drawClock).start();
}
java.text.SimpleDateFormat fmTime = new java.text.SimpleDateFormat("HH:mm:ss");
//绘制图形
public void paint(Graphics g){
super.paint(g);
g.setFont(null);
Graphics2D g2D = (Graphics2D)g;
Insets insets = getInsets();
int L = insets.left/2, T = insets.top/2;
h = getSize().height;
g.setColor(Color.white);
//画圆
g2D.setStroke(new BasicStroke(2.0f));
g.setColor(Color.gray);
g.drawOval(L+40, T+40, h-80, h-80);
r = h/2 - 40;
x0 = 40 + r - 5 + L;
y0 = 40 + r - 5 - T;
ang = 60;
//绘制时钟上的12个字
for(int i = 1;i = 12;i ++){
x = (int)((r+10)*Math.cos(RAD*ang)+x0);
y = (int)((r+10)*Math.sin(RAD*ang)+y0);
g.setColor(Color.black);
g.drawString(""+i, x, h-y);
ang -=30;
}
//获得现在的时间
Calendar now = new GregorianCalendar();
int nowh = now.get(Calendar.HOUR_OF_DAY);
int nowm = now.get(Calendar.MINUTE);
int nows = now.get(Calendar.SECOND);
String st=fmTime.format(now.getTime());
//在窗体上显示时间
g.setColor(Color.pink);
g.fillRect(L, T, 50, 28);
g.setColor(Color.blue);
g.drawString(st,L+2,T+26);
//计算时间与度数的关系
ss = 90 - nows*6;
mm = 90 - nowm*6;
hh = 90 - nowh*30 - nowm/2;
x0 = r+40+L;
y0 = r+40+T;
g2D.setStroke(new BasicStroke(1.2f));
//擦除秒针
//if(olds_x 0){
// g.setColor(getBackground());
// // g.setColor(Color.gray);
// g.drawLine(x0, y0, olds_x, h-olds_y); // (?)
//}
//绘制秒针
x = (int)(r*0.9*Math.cos(RAD*ss))+x0;
y = (int)(r*0.9*Math.sin(RAD*ss))+y0-2*T;
g.setColor(Color.yellow);
g.drawLine(x0, y0, x, h-y);
olds_x = x;
olds_y = y;
g2D.setStroke(new BasicStroke(2.2f));
//擦除分针
//if(old_m!=mm){
// g.setColor(getBackground());
// g.drawLine(x0,y0,oldm_x,h-oldm_y);
//}
//绘制分针
x = (int)(r*0.7*Math.cos(RAD*mm))+x0;
y = (int)(r*0.7*Math.sin(RAD*mm))+y0-2*T;
g.setColor(Color.green);
g.drawLine(x0,y0,x,h-y);
oldm_x = x;
oldm_y = y;
old_m = mm;
g2D.setStroke(new BasicStroke(3.2f));
//擦除时针
//if(old_h!=hh){
// g.setColor(getBackground());
// g.drawLine(x0,y0,oldh_x,h-oldh_y);
//}
//绘制时针
x = (int)(r*0.5*Math.cos(RAD*hh))+x0;
y = (int)(r*0.5*Math.sin(RAD*hh))+y0-2*T;
g.setColor(Color.red);
g.drawLine(x0,y0,x,h-y);
oldh_x = x;
oldh_y = y;
old_h = hh;
}
public static void main(String[] args){
new ClockPointer();
}
}
//整理一下
这里有一个时钟的类，你看一下吧，不明白你的 100毫秒的时钟 是什么意思。
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Line2D;
import java.util.Date;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
public class ClockAs extends Canvas implements ActionListener {
static JButton jb = new JButton("开始");
static JButton jb1 = new JButton("暂停");
Date date;
Timer secondTime;
int hour, munite, second;
Line2D secondLine, muniteLine, hourLine;
int a, b, c;
double pointSX[] = new double[60],// 用来表示秒针端点坐标的数组
pointSY[] = new double[60], pointMX[] = new double[60], // 用来表示分针端点坐标的数组
pointMY[] = new double[60], pointHX[] = new double[60], // 用来表示时针端点坐标的数组
pointHY[] = new double[60];
ClockAs() {
secondTime = new Timer(1000, this);
pointSX[0] = 0; // 12点秒针位置
pointSY[0] = -100;
pointMX[0] = 0; // 12点分针位置
pointMY[0] = -90;
pointHX[0] = 0; // 12点时针位置
pointHY[0] = -70;
double angle = 6 * Math.PI / 180; // 刻度为6度
for (int i = 0; i 59; i++) // 计算出各个数组中的坐标
{
pointSX[i + 1] = pointSX[i] * Math.cos(angle) - Math.sin(angle)
* pointSY[i];
pointSY[i + 1] = pointSY[i] * Math.cos(angle) + pointSX[i]
* Math.sin(angle);
pointMX[i + 1] = pointMX[i] * Math.cos(angle) - Math.sin(angle)
* pointMY[i];
pointMY[i + 1] = pointMY[i] * Math.cos(angle) + pointMX[i]
* Math.sin(angle);
pointHX[i + 1] = pointHX[i] * Math.cos(angle) - Math.sin(angle)
* pointHY[i];
pointHY[i + 1] = pointHY[i] * Math.cos(angle) + pointHX[i]
* Math.sin(angle);
}
for (int i = 0; i 60; i++) {
pointSX[i] = pointSX[i] + 120; // 坐标平移
pointSY[i] = pointSY[i] + 120;
pointMX[i] = pointMX[i] + 120; // 坐标平移
pointMY[i] = pointMY[i] + 120;
pointHX[i] = pointHX[i] + 120; // 坐标平移
pointHY[i] = pointHY[i] + 120;
}
secondLine = new Line2D.Double(0, 0, 0, 0);
muniteLine = new Line2D.Double(0, 0, 0, 0);
hourLine = new Line2D.Double(0, 0, 0, 0);
secondTime.start(); // 秒针开始计时
}
public void paint(Graphics g) {
for (int i = 0; i 60; i++) // 绘制表盘上的小刻度和大刻度
{
int m = (int) pointSX[i];
int n = (int) pointSY[i];
if (i % 5 == 0) {
g.setColor(Color.red);
g.fillOval(m - 4, n - 4, 8, 8);
} else {
g.setColor(Color.cyan);
g.fillOval(m - 2, n - 2, 4, 4);
}
}
g.fillOval(115, 115, 10, 10); // 钟表中心的实心圆
Graphics2D g_2d = (Graphics2D) g;
g_2d.setColor(Color.red);
g_2d.draw(secondLine);
BasicStroke bs = new BasicStroke(3f, BasicStroke.CAP_ROUND,
BasicStroke.JOIN_MITER);
g_2d.setStroke(bs);
g_2d.setColor(Color.blue);
g_2d.draw(muniteLine);
bs = new BasicStroke(6f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER);
g_2d.setStroke(bs);
g_2d.setColor(Color.green);
g_2d.draw(hourLine);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == secondTime) {
date = new Date();
String s = date.toString();
hour = Integer.parseInt(s.substring(11, 13));
munite = Integer.parseInt(s.substring(14, 16));
second = Integer.parseInt(s.substring(17, 19)); // 获取时间中的秒
int h = hour % 12;
a = second; // 秒针端点的坐标
b = munite; // 分针端点的坐标
c = h * 5 + munite / 12; // 时针端点的坐标
secondLine.setLine(120, 120, (int) pointSX[a], (int) pointSY[a]);
muniteLine.setLine(120, 120, (int) pointMX[b], (int) pointMY[b]);
hourLine.setLine(120, 120, (int) pointHX[c], (int) pointHY[c]);
repaint();
}
if (e.getSource() == jb) {
secondTime.start();
}
if (e.getSource() == jb1) {
secondTime.stop();
}
}
public static void main(String args[]) {
JFrame win = new JFrame("时钟");
JPanel jp = new JPanel();
jp.add(jb);
jp.add(jb1);
ClockAs clock = new ClockAs();
jb.addActionListener(clock);
jb1.addActionListener(clock);
win.add(clock, BorderLayout.CENTER);
win.add(jp, "South");
win.setVisible(true);
win.setSize(246, 300);
win.setDefaultCloseOperation(3);
win.validate();
}
}
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();
}
//这是新建了一个public类，名称为Time
public class Time{
//其中有三个变量，表示时分秒
private int hour;
private int minute;
private int second;
//此处即为空参数的构造函数，即当声明这个类的对象时，怎样初始化这个对象里面的值
//每个对象都表示个时间。
//这个构造函数调用了这个类里面的有三个参数的构造函数。
public Time(){
this(0,0,0);
}
//此处为一个参数的构造函数
public Time(int h){
this(h,0,0);
}
//此处为二个参数的构造函数
public Time(int h,int m){
this(h,m,0);
}
//此处为三个参数的构造函数，即前面的构造函数调用了这个构造函数来初始化对象的时间值
public Time(int h,int m,int s){
setTime(h,m,s);
}
//此处是构造函数，参数为这个类的对象：
//即用一个已经表示一个时间的Time对象来创建一个和它一样的时间对象
public Time(Time time){
this(time.getHour(),time.getMinute(),time.getSecond());
}
//设置时间值
public void setTime(int h,int m,int s){
setHour(h);
setMinute(m);
setSecond(s);
}
//设置时
public void setHour(int h){
hour=((h=0h24)?h:0);
}
//设置分
public void setMinute(int m){
minute=((m=0m60)?m:0);
}
//设置秒
public void setSecong(int s){
second=((s=0s60)?s:0);
}
//获得这个时间对象的时
public int getHour(){
return hour;
}
//获得分
public int getMinute(){
return minute;
}
//获得秒
public int getSecond(){
return second;
}
//格式化时间成为串
public String toUniversalString(){
return String.format("%d:%02d:%02d",getHour(),getMinute(),getSecond());
}
//格式化这个时间成为串
public String toString(){
return String.format("%d:%02d:%02d%s",((getHour()==0||getHour()==12)?12:getHour()%12),getMinute(),getSecond(),(getHour()12?"AM":"PM"));
}
}
构造方法：通过这个程序可以看出，一个时间对象表示一个时间，有时分秒，那么创建对象要给它表示个时间，构造函数就是初始化有关的操作。
比如我创建一个对象Time time0=new Time(8,20,20);那么time0就表示8:20:20。
构造函数通常的格式是：public + 类名称（参数列表）{},记住，它没有返回值。
重载：可以看到里面不只一个构造函数，这就是重载。你可能并不一定要确切的时分秒或其它，这样就可以调用不同的构造函数。
比如：Time time1=new Time(time0);这也创建了对象，此对象表示的时间和time0是一样的。
重载的意思是一个函数，参数列表的不同可以实现不同的功能。
import java.awt.*;
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);
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)
{
}
}
}
}
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