Install the downloaded JDK

Verify the installation by checking the below directory

C:/program files/java/jdk1.{version}/bin

Setting Environmental variable. There are two ways to set java path.

Way one:

Set path temporarily

Open cmd prompt and type 

set path="c:/program files/java/jdk 1.{version}/bin"

verfy by typing "javac -version" in cmd

Way two:

Set path permanantly

Open Mycomputer -> right click -->properties--> Advanced system settings --> Advanced(tab) --> Environmental variable

Check for "path" variable in user section, select path and click edit, on pop up box at the end of the value field paste the jdk bin path (use ;(semiclon to seperate each value))

To verify open new cmd promt and type "javac -version"