First off, you need to realise that these are two separate tasks.
1. Read an Excel sheet and populate a Java data structure. I've never needed to research it, but Apache POI is usually recommended for reading Excel files.
2. Populate a default or customised TableModel and attach it to a table displayed in your GUI.
As you go along, you will find the need to further divide these broad, top-level tasks into smaller components, each of which you can work on separately. Good luck!
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