How to refresh one panel depending on the selection of other panel entry

Hi All,
I am new to swing technology. I should get a window on pressing add button (which contains 3 panels ).
first one should contain library sets (Not in a tree structure). Second should display (on selection of library set)the libraries in library set in a tree structure. each library contains some files.when you expand tree in second panel it should show the files inside the library. Up on selection of file 3 panel should br refreshed to show the contents in the file.
Can any one suggest the use full examples and articles regarding this.
Thanks
Raghu

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