How to revert back to OpenJDK?

Question

Well, I was install sun-java, but I want back to OpenJDK 7. I was tray reinstalling from terminal (sudo apt-get install openjdk-7-jre), same from Synaptic and Software Center, but does not work.

I try to use the command java -version and then I get a message like «The java program can be found on follow packages» open-7-jre-headless So... i try to install it, but they ARE installed on my system...

this crazyme... I do no want formar my PC just for Java =/

Thanks.

Answer 1

Use

 update-java-alternatives 

to switch between different implementations without removing or reinstalling and downloading packages.