Java Applet

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• Java Applet

Presented by Feng Liu
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Agenda

• Introduction
• Java Applet vs. JavaScript
• Steps in Creating a Java Applet
• Java Applet Example
• Do I have to write my own
• Summary

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Introduction

• What is JAVA?
• Java is an object oriented programming
  language created by Sun Microsystems
• What is Java Applet?
• A fully functioning small Java
  application
• Used for Web Design
• Need to be embedded into HTML file

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Introduction

• What Java Applet Can do?
• Display message and image on a
  web page
• Draw picture on a web page
• receive input from the user
  through keyboard or mouse
• Play Sound

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Java Applet vs. JavaScript

• Both similar and quite different

Java Applet JavaScript
Created by Sun Created by Netscape
Standalone application Developed outside out of HTML text that is fed into a browser that can read it and then is enacted by the browser.
Must be converted into machine language before it can be run on the web Text based, not need to be compiled
Once it is compiled, it is set. Have to go back to the original text and alter it, then compile again. Can be altered after it runs and run it again and again
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Steps in Creating a Java Applet

• Write the Java Applet Source Code
• import java.applet.Applet
• import java.awt.Graphics
• public class HelloWorldApplet
  extends Applet
• public void paint(Graphics g)
• g.drawString("Hello
  world!", 50, 25)
• compile it

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Steps in Creating a Java Applet

• Write a HTML to call the Applet
• lthtmlgt
• .
• ltapplet CODEHelloWorldApplet.class"
  WIDTH"250" HEIGHT"22"gt
• lt/appletgt
• lt/htmlgt
• Open the HTML file in browser and run it

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Java Applet Example
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Java Applet Example
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Do I have to write my own

• No!
• There are many Java Applet available on the Web
• For Example
• Java Boutique http//javaboutique.
  internet.com/
• Java File http//www.javafile.co
  m/
• Freeware Java
  http//www.freewarejava.com/
  applets/index.shtml
• etc.

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Summary

• Java Applet is part of Java Programming language
• It is a useful tool for the Web Development
• There are thousands of Java Applet available
  online
• If you decide to use those free applets, make
  sure you give the author credits

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References

• HTML HOODIES. (2003). So, You Want A Java Applet,
  Huh!?.
• http//www.htmlgoodies.com/beyond/applet.html
• HTML HOODIES. (2003). Java vs. JavaScript.
• http//www.htmlgoodies.com/beyond/j_vs_js.html
• Smith, D. (1998). Java for the world wide web.
  California Peachpit Press
• What can a Java Applet do?
• http//www.vovisoft.com/java/JavaLecture/Week05/12
  20What20can20a20Java20Applet20do.html

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• Thank you
• Any Question?