Is it possible to display of the tree structure of the Java-code?

Question

I am a newbie in Java. I am trying to figure out how to work this code. It seems to me that it would be very useful if in the beginning I get the general structure of the code (which methods exists and how they are interrelated). For example I see that "main" uses "createAndShowGUI" which, in its turn, uses "addComponentsToPane" and so on. So, the code has kind of a tree structure and it would be nice if I can visualize this structure. Is there any software that can do it. Or, more specifically, can NetBeans do it?

Answer 1

Right clicking on a method name in NetBeans, you can choose Call Hierarchy. It'll open a window with a tree structure displayed. I think it defaults to the callers view. In the window's toolbar you can switch to the callees view. You will then have a navigable tree view of everything the current method calls. Expanding the tree on a callee will show that methods callees. It's not exactly a diagram but should help.