如何使用图形对象清除屏幕？

Question

I need to clear the screen after using a grid of

g.drawRect(x * 32, y * 32, 32, 32);

But I need to dispose of what was there before that frame. Is there a 'clear' method, or something like that?

Answer 1

If you want to clear everything that was painted by the previous call of paintComponent(), then at the beginning of that method, add this call:

super.paintComponent(g);

Otherwise, you could draw a large rectangle over the entire pane, to cover everything up.

Answer 2

g.dispose();

should work to clear your screen. You can read more about it here if you wish to: http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics.html#dispose()