How to erase 2D graphics in the JLayeredPane?

How can I erase 2D graphics(lines) in the JLayeredPane?Is there a example?
Please help me,thanks in advance.

I am anxious to know how to put 2D graphics in 3D TransformGroup, because
I want to pick 2D graphics in 3D scene. For example, I drew some 2D graphics
in 3D scene, line, sphere, rect, I may pick one using mouse. As we know, we can
use PickMouseBehavior to pick 3D Graphics, How can I to 2D Graphics? Thanks a lot!

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How to erase 2D graphics in the JLayeredPane?

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