数字时钟，java实现。

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package clock; /** * * @author SKUSR */ import java.awt.*; import javax.swing.*; class DrawClock extends JPanel { private int hour ; private int minute ; private int second ; private int xCenter, yCenter; private int clockRadius; public DrawClock() { } public void getHMS(int hour, int minute, int second) { this.hour = hour; this.minute = minute; this.second =second; } @Override public void paintComponent(Graphics g) { super.paintComponent(g); clockRadius = (int)(Math.min(getSize().width, getSize().height*0.7*0.5)); xCenter = (getSize().width)/2; yCenter = (getSize().height)/2; g.setColor(Color.black); g.drawOval(xCenter - clockRadius, yCenter - clockRadius, 2*clockRadius, 2*clockRadius); g.drawString("12",xCenter - 5, yCenter-clockRadius); g.drawString("9", xCenter - clockRadius - 10, yCenter + 3); g.drawString("3", xCenter+clockRadius, yCenter + 3); g.drawString("6", xCenter-3, yCenter + clockRadius + 10); int sLength = (int)(clockRadius * 0.9); 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); int mLength = (int)(clockRadius * 0.75); int xMinute = (int)(xCenter + mLength*Math.sin(minute*(2*Math.PI/60))); int yMinute = (int)(yCenter - mLength*Math.cos(minute*(2*Math.PI/60))); g.setColor(Color.blue); g.drawLine(xCenter, yCenter, xMinute, yMinute); int hLength = (int)(clockRadius * 0.6); int xHour = (int)(xCenter + hLength*Math.sin((hour + minute/60.0)*(2*Math.PI/12))); int yHour = (int)(yCenter - hLength*Math.cos((hour + minute/60.0)*(2*Math.PI/12))); g.setColor(Color.green); g.drawLine(xCenter, yCenter, xHour, yHour); g.setColor(Color.red); String time = hour + ": : " + minute + ": : " + second; FontMetrics fm = g.getFontMetrics(); g.drawString(time, (getSize().width - fm.stringWidth(time))/2, yCenter + clockRadius + 30); } }