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凡是出自Window的容器，JFrame/JWindow等，都有这个方法
public Component getFocusOwner()
Returns the child Component of this Window that has focus if this Window is focused;returns null otherwise.
Returns:the child Component with focus, or null if this Window is not focused
public Component getFocusOwner()
Returns the child Component of this Window that has focus if this Window is focused;returns null otherwise.
Returns:the child Component with focus, or null if this Window is not focused
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