The Java Boutique: Java Tutorial: Java by Example: Functions and Arrays

import java.awt.*; import java.applet.*; //we need to import the util package for the time functions import java.util.*; public class Project18 extends Applet implements Runnable { Thread runner; Image Buffer; Graphics gBuffer; public void init() { //create off-screen image we can draw to 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) { //halt the thread for 100 ms here try {runner.sleep(100);} catch (Exception e) { } repaint(); } } public void update(Graphics g) { paint(g); } public void paint (Graphics g) { //create a new time object Date today=new Date(); //get the seconds, minutes and hours int sec=today.getSeconds(); int min=today.getMinutes(); int hour=today.getHours(); String secStr, minStr, hourStr; //copy the time integers to our string objects //if values are less than 10 we add a 0 if(hour<10) hourStr="0"+hour; else hourStr=""+hour; if(min<10) minStr="0"+min; else minStr=""+min; if(sec<10) secStr="0"+sec; else secStr=""+sec; //repaint the background black gBuffer.setColor(Color.black); gBuffer.fillRect(0,0,size().width,size().height); //set a new font we create "on the fly" gBuffer.setFont(new Font("Helvetica", Font.BOLD,65)); gBuffer.setColor(Color.green); gBuffer.drawString(hourStr+":"+minStr+":"+secStr,20,73); //copy the buffer to the screen (no flickering!) g.drawImage (Buffer,0,0, this); } }