有诸多缺点，比如不是时间触发而是靠线程挂起
package com.zhou.clock;import java.awt.*;import java.awt.geom.*;import javax.swing.*;import java.lang.Math;import java.util.Date;public class Clock extends JFrame. {ClockPane cp;public Clock (){super("clock");setDefaultCloseOperation(EXIT_ON_CLOSE);cp=new ClockPane();cp.initTime();//Container content=getContentPane();//content.add(cp);setContentPane(cp);//这句可用上面两句代替setBounds(400,400,200,220);setResizable(false);setVisible(true);}public void interval(){while(true){try{Thread.sleep(1000);}catch(Exception e){}cp.drawClock(cp.getGraphics());}}public static void main(String[] args){Clock clock=new Clock();clock.interval();}class ClockPane extends JPanel{double secondRadian;double minuteRadian;double hourRadian;public void paintCompnent(Graphics comp){drawClock(comp);}public void initTime(){Date d=new Date();int hours=d.getHours();int minutes=d.getMinutes();int seconds=d.getSeconds();hourRadian=hours*Math.PI/6 + ((float)minutes/60)*Math.PI/6;minuteRadian=minutes*Math.PI/30;secondRadian=seconds*Math.PI/30;}public void drawClock(Graphics comp){Graphics2D comp2D= (Graphics2D)comp;comp2D.setColor(Color.GRAY);BasicStroke pen=new BasicStroke(10F,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);comp2D.setStroke(pen);Arc2D.Float circle=new Arc2D.Float(20F,20F,150F,150F,0F,360F,Arc2D.OPEN);comp2D.draw(circle);comp2D.setColor(Color.white);comp2D.fill(circle);pen=new BasicStroke(1F,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);comp2D.setStroke(pen);comp2D.setColor(Color.CYAN);circle=new Arc2D.Float(20.5F,20.5F,149F,149F,0F,360F,Arc2D.OPEN);comp2D.draw(circle);comp2D.setColor(Color.black);pen=new BasicStroke(8F,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);comp2D.setStroke(pen);Pin stake=new Pin(95.0,95.0,75.0);double stakeRadian=0;for(int i=0;i<12;i++){comp2D.draw(stake.createStake(stakeRadian));stakeRadian+=Math.PI/6;}pen=new BasicStroke(2F,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);comp2D.setStroke(pen);comp2D.setColor(Color.CYAN);for(int i=0;i<12;i++){comp2D.draw(stake.createStake(stakeRadian));stakeRadian+=Math.PI/6;}comp2D.setColor(Color.DARK_GRAY);Pin secondPin =new Pin(95.0,95.0,65.0);Pin minutePin =new Pin(95.0,95.0,50.0);Pin hourPin =new Pin(95.0,95.0,40.0);pen =new BasicStroke(2F,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);BasicStroke pen1=new BasicStroke(3F,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);BasicStroke pen2=new BasicStroke(4F,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);initTime();comp2D.setStroke(pen);comp2D.draw(secondPin.createPin(secondRadian));comp2D.setStroke(pen1);comp2D.draw(minutePin.createPin(minuteRadian));comp2D.setStroke(pen2);comp2D.draw(hourPin.createPin(hourRadian));}}}package com.zhou.clock;import java.awt.*;import java.awt.geom.*;import javax.swing.*;import java.lang.Math;public class Pin{double constantX;double constantY;double length;public Pin(double inputX, double inputY, double inputLength){constantX=inputX;constantY=inputY;length =inputLength;}public Line2D.Double createPin(double radian){double variableX;double variableY;variableX=constantX+length*Math.sin(radian);variableY=constantY-length*Math.cos(radian);Line2D.Double ln=new Line2D.Double(constantX,constantY,variableX,variableY);return ln;}public Line2D.Double createStake(double radian){double innerX;double innerY;double outerX;double outerY;innerX=constantX+(length-15)*Math.sin(radian);innerY=constantY-(length-15)*Math.cos(radian);uterX=constantX+length*Math.sin(radian);uterY=constantY-length*Math.cos(radian);Line2D.Double ln=new Line2D.Double(innerX,innerY,outerX,outerY);return ln;}}
