Lab 2 setup instructions

Downloading files and setting up a working directory

• Download the code for this lab into the directory you want to work in.
  lab2.tar (Right-click -> Save Target As...)
• Extract the contents of the tar file. Find the file and double-click on it. The file should open up automatically in WinZip.
• Click the Extract button. Then pick the directory to place the files by typing it into the Extract to: textbox or browsing the file tree.
• Be sure that Use folder names is checked off.
• Then click the Extract button.
• Notice that a folder called lab2 is created. Inside this folder are two items:
  • ballworld.jar this contains the compiled ballworld code.
  • java this contains the ballworld source code. you shouldn't need to use this at all, but it is available for your reference.
• Your working directory is the lab2 directory.

Setting up DrJava

• Start DrJava
• Select Edit-->Preferences
• For Resource Locations-->Extra Classpath, click the Add button and navigate and select the ballworld.jar
• For Miscellaneous-->Indent Level, change it to 4.
• For Miscellaneous-->Working Directory, select the lab2 directory created by extracting the tar file.
• Click Apply and OK.

Running Ballworld

• Navigate to your lab2 directory and Right-click-->Open Command Window Here
  If you don't have Open Command Window Here installed, then just open a command window to the directory.
• At the prompt, type the following and hit Enter:
      java -jar ballworld.BallWorldGUI
• BallWorld should start up. You can load the classes you write using the File-->Load Ball...

Writing your first class

• DrJava starts off with an untitled file. Start off by typing in the beginning of your first class, Dud. Do not specify any package names (contrary to the lab handout)!
• Save the file, be sure to save it in the lab2 folder.
• Hit Compile All to compile the code.
• When your class is done, load it into BallWorld using the File menu.
• The "fully qualified classname" is your classname prefaced by the package it is in. Since we're not using any packages, just type in the name of your class.