Accordion for Swing? [closed]

Answer 1

You can get one free at http://www.javaswingcomponents.com/product/accordion it used to be commercial, but now is free.

Answer 2

Here is one that is free :

http://blue-walrus.com/2015/02/new-outlookbarslidepaneaccordian/

You can also embed internal accordions too (see image)

Arrows, look and feel are also customizable.