Step 1. Install java JDK
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
Step 2. install eclipse.
For windows 64 bits machine:
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html Windows x64 169.62 MB
http://www.oracle.com/ocom/groups/public/@otn/documents/digitalasset/115899.gif jdk-8u25-windows-x64.exe
For windows 32 bits machine:
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html Windows x86 157.26 MB
http://www.oracle.com/ocom/groups/public/@otn/documents/digitalasset/115899.gif jdk-8u25-windows-i586.exe
for mac os x 64 bit:
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
https://www.eclipse.org/downloads/download.php?file=/technology/epp/downloads/release/luna/SR1a/eclipse-java-luna-SR1a-macosx-cocoa-x86_64.tar.gz