电脑时钟java代码讲解 java电子时钟代码

JAVA时钟代码解释

lz这个代码有什么看不懂的 如果这个代码看不懂的话 建议你从基础的开始学习吧

首先可以看到extends JFrame implements ActionListener 关于ActionListener 接口和JFrame 类lz有必要去看看 加入api慢慢研究下吧

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;

这些东西我也看不懂 因为你的代码不完整

final double RAD=Math.PI/180; 这个应该是算一个弧度吧

super("made by mcj and wdh"); 这句无意义 是父类的代码

setDefaultCloseOperation(3);这个方法是什么？？代码不完整

setSize(300,300);设置窗体大小

setBackground(Color.white);设置背景色

setLocation(300,150); 定位

setResizable(false);不调整大小

setVisible(true);可见

后面的就没有代码了

相关问答

Q1: 用 java 写一个clock的类，100毫秒的时钟 求代码。。越简单越好。。最好有注释

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();

}

}

Q2: java编程利用按钮实现时钟的停止和开始功能（原代码）

如下：

import java.awt.*;

import java.awt.event.*;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.Timer;

import java.awt.geom.*;

import java.util.*;

class Clock 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];

Clock()

{ 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;i59;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;i60;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;i60;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);

     Clock clock=new Clock();

     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();

   }

}

运行截图：

有问题就追问，满意请采纳。

Q3: JAVA画时钟代码

import java.awt.*;

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电脑时钟java代码讲解，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;

        //绘制时钟上电脑时钟java代码讲解的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;

        }

        //获得现在电脑时钟java代码讲解的时间

        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);

        

        //计算时间与度数电脑时钟java代码讲解的关系

        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

Q4: JAVA中关于时钟的程序，高分跪求解释

你这个比较有点意思， 呵呵

就说一个吧，时针怎么算

360 * minutes / (12 * 60) 这个很容易理解，就是当前分针多少度。

90 - 360 * minutes / (12 * 60)

为什么是90减去 360 * minutes / (12 * 60)呢？

其实写成 0 减去 360 * minutes / (12 * 60)也可以。你不过那样的话，你的表会快3个小时

日常来说的几点是相对于12点的位置来讲的，要是用图形描述的话就是 Y轴， 90度的位置

这里用90减去360 * minutes / (12 * 60)实在计算时针距离12点的相对弧度。

剩下的你自己看吧。估计差不多了

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