顶层容器(Top-Level Containers) JWindow JFrame JDialog JApplet 这4个顶层容器，都是属于重量级组 件（Swing中只有这4个是属重量级 组件），与当地的GUI资源有...
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Because all the top-level containers need the same set of objects, their management is delegated to JRootPane.
因为所有的顶级容器都需要相同的对象集合，所以其管理被委派给JRootPane。
The Window can contain many different top-level and intermediate-level containers.
Window可以包含多个不同的顶级和中级容器。
It is not recommended to override paint of top level containers.
不建议重写油漆顶层容器。
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