I was wondering, I am sure I have sometimes (by accident) in netbeans opened the source-file of a class I was using in my program (say, for example, Integer), and I was wondering how to do this in Eclipse.
I was also wondering, are all source-files of the entire java SE api included in the jdk installation? Where in the installation can I find them?
rt.jar contains the runtime classes of the Java API; these are all the classes and interfaces listed in the API documentation. The other jars contain non-public implementation classes that you shouldn't be using directly in your program.