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Editorial Team
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Asked: 2026-05-30T08:20:41+00:00

I have following code: canvas=new MembershipFunctionComponent(functions); canvas.setPreferredSize(new Dimension((int)this.getWidth(), (int)this.getHeight())); canvas.addMouseListener(canvas); pane.add(canvas); MembsershipFunctionComponent extends JComponent.

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I have following code:

        canvas=new MembershipFunctionComponent(functions);
        canvas.setPreferredSize(new Dimension((int)this.getWidth(), (int)this.getHeight()));
        canvas.addMouseListener(canvas);
        pane.add(canvas);

MembsershipFunctionComponent extends JComponent. Why is paintComponent method executed 2 times?

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1 Answer

  1. Editorial Team

    paintComponent can get called at pretty much any time by the Swing framework. Examples of when this might happen:

    • Any time a component is resized
    • Any time part of the component is revealed (for example in a scrollable window)
    • Any time the repaint() method is called on your component (or possibly a parent or sub-component)
    • Any time there is a layout change

    None of this should worry you – you should just write your code so that it doesn’t care how many times paintComponent is called.

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