如何使用JFrame完成动态模拟时钟

如何使用JFrame完成动态模拟时钟

这篇文章介绍了使用JFrame完成动态模拟时钟，在面板中绘制时钟并提取系统当前时刻，主方法中暂停线程1秒，刷新面板。

实现代码如下

import javax.swing.*;

import java.awt.*;

import java.util.*;

import java.lang.Thread;

import java.text.DecimalFormat;

public class StillClock extends JPanel {

/**

* @param args

*/

private int hour;

private int minute;

private int second;

//构造函数

public StillClock() {

setCurrentTime();

}

//返回小时

public int getHour() {

return hour;

}

public int getMinute() {

return minute;

}

public int getSecond() {

return second;

}

//绘制时钟

protected void paintComponent(Graphics g) {

super.paintComponent(g);

//初始化

int clockRadius = (int)(Math.min(getWidth(), getHeight(http://)) * 0.8 * 0.5);

int xCenter = getWidth() / 2;

int yCenter = getHeight() / 2;

//画圆

g.setColor(Color.black);

g.drawOval(xCenter - clockRadius, yCenter - clockRadius, 2 * clockRadius, 2 * clockRadius);

g.drawString("12", xCenter - 5, yCenter - clockRadius + 15);

g.drawString("9", xCenter - clockRadius + 3, yCenter + 5);

g.drawString("3", xCenter + clockRadius - 10, yCenter + 3);

g.drawString("6", xCenter - 3, yCenter + clockRadius - 3);

//画秒针

int sLength = (int)(clockRadius * 0.8);

int xSecond = (int)(xCenter + sLength * Math.sin(second * (2 * Math.PI / 60)));

int ySecond = (int)(yCenter - sLength * Math.cos(second * (2 * Math.PI / 60)));

g.setColor(Color.red);

g.drawLine(xCenter, yCenter, xSecond, ySecond);

//画分针

int mLenth = (int)(clockRadius * 0.65);

int xMinute = (int)(xCenter + mLenth * Math.sin(minute * (2 * Math.PI / 60)));

int yMinute = (int)(xCenter - mLenth * Math.cos(minute * (2 * Math.PI / 60)));

g.setColor(Color.blue);

g.drawLine(xCenter, yCenter, xMinute, yMinute);

//画时针

int hLength = (int)(clockRadius * 0.5);

int xHour = (int)(xCenter + hLength * Math.sin((hour % 12 + minute / 60.0) * (2 * Math.PI / 12)));

int yHour = (int)(yCenter - hLength * Math.cos((hour % 12 + minute / 60.0) * (2 * Math.PI / 12)));

g.setColor(Color.green);

g.drawLine(xCenter, yCenter, xHour, yHour);

//画数字时钟

g.setColor(Color.black);

DecimalFormat s=new DecimalFormat("00");

g.drawString(s.format(getHour()) + ":" + s.format(getMinute()) + ":" + s.format(getSecond()), xCenter - 22, yCenter - clockRadius - 15);

}

public void setCurrentTime() {

Calendar calendar = new GregorianCalendar();

this.hour = calendar.get(Calendar.HOUR_OF_DAY);

this.minute = calendar.get(Calendar.MINUTE);

this.second = calendar.get(Calendar.SECOND);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

JFrame frame = new JFrame("DiaplayClock");

frame.setResizable(false);

frame.setTitle("DiaplayClock");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(300,350);

frame.setVisible(true);

while(true) {

StillClock clock = new StillClock();

frame.getContentPane().add(clock);

clock.setVisible(true);

frame.validate();

try {

Thread.sleep(1000);

}

catch (InterruptedException e) {

e.printStackTrace();

}

clock.setVisible(false);

frame.remove(clock);

clock = null;

frame.validate();

}

}

}

效果图：

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