Do I need to switch javac to version 7?-Collection of common programming errors

I’ve setup Java 7 at /usr/bin/java in ubuntu 12.04 to replace the default which is Java 6.

I have done the same for /usr/bin/javaws.

Do I also need to do this for /usr/bin/javac in order to be fully consistent? For some reason /usr/bin/javac does not exist by default. Running javac -verion only produces a suggestion that I use apt-get to install it but hesitate to jump to the conclusion that it is not installed. Of course if I use javac I would want to be consistent and have version 7, but I’m not sure if I use javac.

I create .jar files using Eclipse and I’m not sure what goes on inside Eclipse.