COP 3530

1. COP 3530 JDK Environment Variables

2. COP 3530 JDK Environment Variables Environment Variables Environment variables are a set of dynamic values that can affect the way processes behave on a computer. [1]

3. COP 3530 JDK Environment Variables PATH PATH is an environment variable listing a set of paths to directories where executables may be found. [2]

4. COP 3530 JDK Environment Variables CLASSPATH CLASSPATH is an environment variable that tells the Java Virtual Machine where to look for user-defined classes and packages in Java programs. [3]

5. COP 3530 JDK Environment Variables Setting the PATH and CLASSPATH in Microsoft Windows Vista Step 1: Click Start → Control Panel → System and Maintenance → System.

6. COP 3530 JDK Environment Variables Setting the PATH and CLASSPATH in Microsoft Windows Vista Step 2: Select Advanced system settings.

7. COP 3530 JDK Environment Variables Setting the PATH and CLASSPATH in Microsoft Windows Vista Step 3: On the Advanced tab of the System Properties window, select Environment Variables.

8. COP 3530 JDK Environment Variables Setting the PATH Step 4a: Update your system PATH by selecting it in the System variableslist and clicking Edit. If the PATH variable does not exit, create a new one via New. Append the location of the bin folder of your JDK installation to PATH in System variables. A typical value for the location is below. C:\Program Files\Java\jdk1.6.0_<version>\bin. The PATH environment variable is a series of directories separated by semi-colons (;) and is not case sensitive. Microsoft Windows looks for programs in the PATH directories in order, from left to right. You should only have one bin directory for a JDK in the path at a time. If you are not sure where to add the path, append it to the right end of the PATH. The new path takes effect in each new command window you open after setting the PATH variable.

9. COP 3530 JDK Environment Variables Setting the CLASSPATH Step 4b: Update your user CLASSPATH by selecting it in the User variableslist and clicking Edit. If the CLASSPATH variable does not exit, create a new one via New. Append the working directory (if it is not listed) and the directory of the code for the textbook. An example entry is below. .; C:\COP3530\eprogs The symbol “.” signifies the working directory. The changes take effect in each new command window you open after setting the CLASSPATH variable.

10. COP 3530 JDK Environment Variables Setting the PATH and CLASSPATH in Microsoft Windows Step 5: Test your settings. Open a command prompt and go to the directory of the code for the texbook. Enter the dataStructures directory, then run the commands below at the prompt. javac ArrayLinearList.java java dataStructures.ArrayLinearList The desired output is below. Initial size is 0 The list is empty List size is 4 The list is [1, 2, 4, 6] The index of 4 is 2 3 not found Element at 0 is 1 Element at 3 is 6 2 removed The list is [1, 4, 6] 6 removed The list is [1, 4] The list is not empty List size is 2

11. COP 3530 JDK Environment Variables References [1] http://en.wikipedia.org/wiki/Environment_variable [2] http://en.wikipedia.org/wiki/Path_(computing) [3] http://en.wikipedia.org/wiki/Classpath_(Java)