Put the following code into the HelloWorld. In this directory, create a program called HelloWorld.java.That is why when you make a simple little java file and compile it, the resulting. Select System Advanced Environment Variables Create a new variable called. One of the directories in the list should be. Install Apache Ant Click on the Start Menu.

The classpath tells java which directories to check in when looking for. Log onto gaul and type the unix command: echo $CLASSPATH.

If you get an error and you think you did the step correctly, read ahead to the next step incase the error was expected.

When doing this workshop, I occasionally have you purposely cause an error.

Let's try playing around with packages and the classpath variable on Gaul: Understanding the Classpath variable Thus, even if the current directory that we are in contains a class called Runme.class and we type: java Runme IF THE CLASSPATH IS NOT POINTING AT THE CURRENT DIRECTORY (the. class files to run with the java command. The classpath variable tells the system which directories to look in to find the. It is also helpful to understand the classpath variable and what it is used for.

For example Homer Simpson might write a class called Circle and Peter Griffin might write a class called Circle, how will our program decide which is the correct one to use? That is where packages come in handy. Packages are used to help distinguish one class with the same name from another class with the same name. Package, Jar, Ant Workshop Using Java Packages, Jar Files and Ant Files Part 1: Packages

Apache ant access environment variables