How to start Java on your computer.

Install Java Development Kit(JDK)
Install Java Runtime Environment(JRE)

Then install a compiler for java like.. Eclipse, Netbeans etc.

Here the following link:

For JDK: https://jdk8.java.net/download.html
For JRE:http://www.oracle.com/technetwork/java/javase/downloads/jre8-downloads-2133155.html

For Eclipse: https://eclipse.org/downloads/

 Computer Engineer Zone
Barisal, Bangladesh.