包含时钟系统java源代码的词条

怎样用java 程序写一个时钟程序

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();

}

相关问答

Q1: java程序 时钟 整点报时代码

import java.awt.*;

import java.util.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.Timer;

public class Test extends JFrame implements ActionListener{

Timer t=new Timer(1000,this);

GregorianCalendar calendar=new GregorianCalendar();

JLabel label1=new JLabel(new Date().toString()),

label2=new JLabel("

");

public Test(){

super("TIME");

Container c=this.getContentPane();

c.setLayout(new FlowLayout());

c.add(label1);c.add(label2);

t.start();

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setBounds(200,200,200,100);

this.setVisible(true);

}

public void actionPerformed(ActionEvent e){

Date date=new Date();

calendar.setTime(date);

if(e.getSource()==t){

label1.setText(date.toString());

if(calendar.get(Calendar.MINUTE)==0)//当分钟为0报时

if(calendar.get(Calendar.SECOND)=5){//持续5秒报时

if(calendar.get(Calendar.SECOND)%2==0)

label2.setText("现在是北京时间"+calendar.get(Calendar.HOUR_OF_DAY)+"点整。");

if(calendar.get(Calendar.SECOND)%2==1)

label2.setText("

");

}

}

}

public static void main (String[] args) {

new Test();

}

}

Q2: 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，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