Repaint without clearing?

As you've discovered, you need to call super. PaintComponent(g) otherwise, the JPanel background doesn't get painted and everything is a mess. The problem is that only one shape can be drawn at any one time as the draw field can only be a single value.

One solution would be to create an ArrayList of shapes and draw each shape in the List in paintComponent .

Custom Painting Approaches shows the two common solutions to this problem.

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