How to set JDK in Eclipse

Question

I have JDK installed for Java 6 as well as for Java 7.

I am trying to build my project using both. How are these options added to the IDE? How would I get this to appear in the list? I have added two different JREs in my IDE preferences, but these are not what appears in the dropdown list.

How can we add JDK for both the versions on Eclipse?

Answer 1

To manage the list of compilers go to Window -> Preferences -> Java -> Installed JRE's tab

Go to project build path configuration -> libraries tab, you can delete the entry for "JRE System Library", click on "Add Library" and choose the installed JRE to compile with. Some compilers can be configured to compile at a back-level compiler version.