Given that a JInternalFrame is a not a heavyweight window, it needs special behavior to deal with when it is first shown.

假设JInternal Frame不是重量级的窗口，那么当它初次显示时需要处理一些特有的行为。

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In addition, capabilities like the multi-document interface (MDI) — called JInternalFrame in Swing — are not part of the framework but are left to the underlying window manager.

此外，多文件接口(multi - document interface, MDI)——在Swing中称为JInternal Frame——等功能不是框架的一部分，它位于基本的窗口管理器的左侧。

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