要使已有的组件显示新的界面外观, 在每个顶层容器(top-level container)(译者注:顶层容器, 例如在Swing中一般为JFrame, JApplet, JDialog或其子类的对象)调用类SwingUtilities的updateComponentTreeUI方...
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A place is a top-level container for all the pages and components.
位置是所有页面和组件的顶层容器。
A containment hierarchy is a tree of components that has a top-level container as its root. We'll show you one in a bit.
一个控制层次是一个拥有一个顶层容器作为它的根的树组件。
Each top-level container has a content pane that, generally speaking, contains (directly or indirectly) the visible components in that top-level container's GUI.
每一个顶层的容器都会有一个内容面板，一般来说，它直接或间接地包含在顶层容器GUI中可见的组件。
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