This instructable will teach you how to: 

1. Install the Java Development Kit.

2. Set system variables to easily be able to compile and execute java files.

3.  Compile and execute a Java file from Command Prompt.  

** This is mainly for Windows 7 and Vista.

Step 1: Download latest JDK

1.Follow this link: http://www.oracle.com/technetwork/java/javase/downloads/index.html
2. Click Download JDK under the download Java Standard Edition panel.
3. Choose your operating System and agree to the terms of service. **
** This will  probably be Windows since your using Command Prompt.

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