Java at Boston University

Availability and Setup

Applets Written Locally

All applets are Beta applets that should run under Netscape 2.0 unless otherwise indicated.
• Schrödinger Wave Equation Simulation - by Steve Harrington
• Fractals in Science - Java Applets written at the Center for Polymer Studies.
• 9 Piece Puzzle Game - by Aaron Fuegi (source included)
• CafeSweeper Game - by Aaron Fuegi
• ARMADA Game - by Aaron Fuegi

Java Help and Documentation

• Java News
  • Java Users Group mailing list created (4/4/96)
• Java Resources on SCV systems
  • Java Development Kit Class List
  • Java Development Kit Documentation
  • Sun's Java Programming Tutorial
• Documentation at SUN
• Java FAQ - by E. R. Harrold
• Java Tutorial - by E. R. Harrold

Outside Java Resources

• Information
  • The Java Programming Language
  • Club Java (includes Java Class Hierarchy Diagrams)
• Applets
  • Gamelan
  • Java Repository

Creating a Simple Applet (Hello World)

Steps
1. Save the file HelloWorld.java to a machine with a Java compiler on it such as CGL or Tonka and make sure to keep the name HelloWorld.java.
2. Compile the file you just saved on that machine using the command javac HelloWorld.java. This will create a Java bytecode binary file called HelloWorld.class.
3. Copy this HelloWorld.class file onto a machine running a Web server and place it in an accessible Web directory such as ~username/public_html/. (If you do not have access to a machine running a Web server, leave the .class file where it is and see the final step below.)
4. Save the file hello.html in the same place you just placed the .class file. The name of this file is not important but it must be in the same directory as the .class file. Make sure the permissions for both this file and the .class file are such that anyone can access them.
5. Launch a Java-capable browser such as Netscape or appletviewer and open the URL for hello.html and it should look like this.
6. If you did not have access to a machine running a Web server, you should still be able to view your applet. Launch your Java-capable browser on the same machine as you placed the .class and .html files (such as CGL or Tonka). Now use the Open File... command under the File menu in Netscape to open the .html file by its Unix directory location on that machine - do not try to specify a URL.