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我必须学习 Java,我选择了 Eclipse 来编写 Java。不幸的是,有些方法不能正常工作。例如“DrawingPanel”我的问题是我必须做什么来激活这个方法。
那是因为您没有DrawingPanel类(?)您要么必须创建一个DrawingPanel扩展 a 的类,JPanel要么导入包含DrawingPanel类的包。
DrawingPanel
JPanel
编辑: 如果您的 DrawingPanel 类位于 Panels 包下。这将是 import Panels.DrawingPanel
import Panels.DrawingPanel
如果你有一个包 Panels/CoolDrawingPanels 它会转化为 import Panels.CoolDrawingPanels.DrawingPanel
import Panels.CoolDrawingPanels.DrawingPanel