IBM User Guide for Java V7 on Windows > Installing and configuring the SDK and Runtime Environment

Setting the class path

The class path tells the SDK tools, such as java, javac, and the javadoc tool, where to find the Java™ class libraries.

You should set the class path explicitly only if:

• You require a different library or class file, such as one that you develop, and it is not in the current directory.
• You change the location of the bin and lib directories and they no longer have the same parent directory.
• You plan to develop or run applications using different runtime environments on the same system.

To display the current value of your CLASSPATH environment variable, type the following command at a command prompt:

  echo %CLASSPATH%

If you develop and run applications that use different runtime environments, including other versions that you have installed separately, you must set the CLASSPATH and PATH explicitly for each application. If you run multiple applications simultaneously and use different runtime environments, each application must run in its own command prompt.

Parent: Installing and configuring the SDK and Runtime Environment

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