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Asked: 2026-06-18T10:31:29+00:00

I have a standard paintComponent() method that draw some shapes on a Swing JPanel,

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I have a standard paintComponent() method that draw some shapes on a Swing JPanel, via Java2D.

Initially, the JPanel surface is displayed with a clean white background.

After the user select a file, I build the shapes (in a separated thread) based on the instructions on the file.

Then, I call JPanel’s rapaint() method, you know, will be handled at the EDT.

I can tell when the repaint() processing ends: I just need to look at the new drawings on the screen.

So, this morning I don’t have many ideas to answer THE QUESTION: how to know the same information via code?

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1 Answer

  1. Editorial Team

    You don’t have any automatic notification, but you can set a boolean variable or call a method at the end of your paintComponent().

    Note that normally you should not have this problem, because paintComponent() is supposed to contain only code that executes fast, any initialization/calculation should be moved to another method.

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