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java repaint() 方法无法执行，不知道是哪个原因

直接贴代码，因为复制的不对，开头有些空格别在意 package fighting; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event ...
Ars Technica

Java swing repaint problem

* The program does not seem to be refreshing the screen correctly.