Java Applet Presented by Feng Liu Agenda Introduction

Java Applet Presented by: Feng Liu

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

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

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

Java Applet vs. Java. Script • Both similar and quite different Java Applet Java. Script 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 Can be altered after it runs and run it again and again alter it, then compile again.

Steps in Creating a Java Applet • Write the Java Applet Source Code import java. applet. Applet; import java. awt. Graphics; public class Hello. World. Applet extends Applet { public void paint(Graphics g) { g. draw. String("Hello world!", 50, 25); } } • compile it

Steps in Creating a Java Applet • Write a HTML to call the Applet <html> ……. <applet CODE=“Hello. World. Applet. class" WIDTH="250" HEIGHT="22"> </applet> …… </html> • Open the HTML file in browser and run it

Java Applet Example

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. com/ Freeware Java http: //www. freewarejava. com/applets/index. shtml etc.

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

References • HTML HOODIES. (2003). So, You Want A Java Applet, Huh!? . http: //www. htmlgoodies. com/beyond/applet. html • HTML HOODIES. (2003). Java vs. Java. Script. 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/Java. Lecture/Week 05/12%20 What%20 can%2 0 a%20 Java%20 Applet%20 do. html

Thank you Any Question?