If you are referencing members of the Java class (which I assume you have used NetBeans before), this is currently not supported in Atom.
Atom is a (fairly simple) editor that allows you to edit text files, and full-screen IDEs (Integrated Development Environments), such as Eclipse, NetBeans, or IntelliJ IDEA, have full language support, including launching, debugging, and viewing Java class information. It might be better to stick with one of the IDE that I talked about if you are looking for such functionality.
Having said that, there is a https://atom.io/packages/atom-ctags package that supposedly can display some meta information about the classes you are working on. This is primarily for C ++, although it may work for Java (I have not tried).
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