installing jdk,

1. http://www.oracle.com/technetwork/java/index.html

Java Se -> click

2. download

3.  accopt, OS check & download

4. install

5. click

6. click

description - create -> JAVA_HOME(name) / values(C:\Program File\Java..blahblah

description - Path select -> edit -> values -> ;C:\Program File\Java..blahblah

7. check!!  javac(loated jdk\bin)