Tutorials : Java by Example : Section 7 :

With the knowledge we have gained now, it is not very difficult to make a real analog clock with hands, like this one here. Note that Java doesn't allow to specify a pen with more than 1 pixel width, so you would have to draw several parallel lines in order to increase the width of the clock hands.

//Sourcecode import java.awt.*; import java.applet.*; import java.util.*; public class Project41 extends Applet implements Runnable { Thread runner; Image Buffer; Graphics gBuffer; int angle; public void init() { Buffer=createImage(size().width,size().height); gBuffer=Buffer.getGraphics(); } public void start() { if (runner == null) { runner = new Thread (this); runner.start(); } } public void stop() { if (runner != null) { runner.stop(); runner = null; } } public void run() { while(true) { try {runner.sleep(100);} catch (Exception e) { } repaint(); } } void drawStuff() { //paint background black gBuffer.setColor(Color.black); gBuffer.fillRect(0,0,size().width,size().height); //get the center of the applet Point p=new Point(size().width/2, size().height/2); //define the hand lengths int S_LENGTH=85, M_LENGTH=80, H_LENGTH=60; Date d=new Date(); int sec=d.getSeconds(); int min=d.getMinutes(); int hour=d.getHours(); //calculate the vectors, using the constant Pi double vs = sec * Math.PI*2 / 60.0; double vm = min * Math.PI*2 / 60.0; double vh = hour * Math.PI*2 / 12.0 + vm / 12.0; int sx=(int)(p.x+S_LENGTH*Math.sin(vs)); int sy=(int)(p.y-S_LENGTH*Math.cos(vs)); int mx=(int)(p.x+M_LENGTH*Math.sin(vm)); int my=(int)(p.y-M_LENGTH*Math.cos(vm)); int hx=(int)(p.x+H_LENGTH*Math.sin(vh)); int hy=(int)(p.y-H_LENGTH*Math.cos(vh)); //the second hand gBuffer.setColor(Color.yellow); gBuffer.drawLine(p.x, p.y, sx, sy); //the minute hand gBuffer.setColor(Color.red); gBuffer.drawLine(p.x, p.y, mx, my); //the hour hand gBuffer.setColor(Color.green); gBuffer.drawLine(p.x, p.y, hx, hy); //the face and axis gBuffer.setColor(Color.blue); gBuffer.fillOval(p.x-6,p.y-6,12,12); gBuffer.drawOval(p.x-90,p.y-90,180,180); } public void update(Graphics g) { paint(g); } public void paint(Graphics g) { drawStuff(); g.drawImage (Buffer,0,0, this); } }