How to create a tree view in displaying the hierarchy of classes,methods,variables in an editor using Java?

I am developing a multi language editor for C,C++,java. I am developing this tool using Java(Swing concepts). I want to create a tree view in displaying the hierarchy of classes,methods, variables that are involved in the file on the left side of the editor as like in other editors such as JCreator,netbeans, etc... Is there any source code available or any solutions?

How to create a tree view in displaying the hierarchy of classes,methods,variables in an editor using Java?
Can create tree structure using JTree component and java Reflection API