How to use Java8 to compile in eclipse

1. There is currently no support for Java8 compile in eclipse (my version of Kepler).
The figure adds jdk8,jdk7,jdk6 to eclipse, but at compile level there are only:

No 1.8 appeared. As you can see, compile uses a built-in compiler and does not use the Javac in JDK.

2. The solution. Http://stackoverflow.com/questions/8122843/how-to-have-eclipse-use-jdk8-to-compile-a-project

Conclusion: The above method is not very useful. I choose to change eclipse, my version is Kepler, replaced by Luna.