Environment Variables ~ Java Researches

Many operating systems use environment variables to pass configuration information to applications.
Like properties in the Java platform, environment variables are key/value pairs, where both the key and the value are strings.
The conventions for setting and using environment variables vary between operating systems, and also between command line interpreters.

PATH and CLASSPATH:

This section explains how to use the PATH and CLASSPATH environment variables on Microsoft Windows, Solaris, and Linux.

Consult the installation instructions included with your installation of the Java Development Kit (JDK) software bundle for current information.

After installing the software, the JDK directory will have the structure shown below.

The bin directory contains both the compiler and the launcher.

PATH:

The PATH is the system variable that your operating system uses to locate needed executables from the command line or Terminal window.

The PATH system variable can be set using System Utility in control panel on Windows, or in your shell's startup file on Linux and Solaris.

Making changes to the system PATH variable is typically not necessary for computers running Windows or Mac OS X.

Windows: ( 2000/XP/vista/Window 7,8 )

Step 1: Right click on my computer and select properties.

Step 2: Go to the Advance System Settings tab.

Step 3: Click on Environment Variables button.

Step 4: Now alter the path variable so that it also contains the path to JDK installed directory.

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