Java Gui(Swing)关于简单Animation的问题

Question

i have a class that extends JFrame. and i need that some rectangle move on my screen, what the best way to do it?

Answer 1

1. According to the docs JComponent#paintComponent , the method firm is protected and not public

   protected void paintComponent(Graphics g)

   Write @Override on top of that method so that your compiler can show you warnings in case you're writing something wrong.

2. Never, ever! start a Timer inside paintComponent , it will get called several times, just by moving your mouse in the app it will get called and you have no control over it, so you will run into issues due to that.