Paint for Java Swing

Hello, I am making a java Swing application. I want to simulate an MS Paint in my own application (you can draw lines, circles, squares ...) I intend that this drawing is saved and loaded.
Any ideas or references?
Thank you.

This is custom painting through Java2D. The book "Filthy Rich Clients" is a really good reference on that.
http://filthyrichclients.org/
And as always, the place to start is the Swing tutorial:
http://docs.oracle.com/javase/tutorial/uiswing/
The rest is up to how good you use that brain of yours ;) Feel free to drop in when you have more specific questions or are struggling with a piece of code, I wouldn't expect too much response from open ended "how I do this?" type questions.

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