Java Installation

For Linux
1. Download jdk-7u2-linux-64.rpm from here.
2. # rpm -ivh jdk-7u2-linux-64.rpm
3. Perform java and javac instruction.

For Windows
1. Download jdk-7u2-windows-64.exe from here. 
2. Double click jdk-7u2-windows-64.exe to install.
3. Set the environment variable (i.e., path & JAVA_HOME)
4. Perform java and javac in your command to test.