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Class javax.swing.JInternalFrame

Added Methods
void doDefaultCloseAction()  
Component getFocusOwner() If this JInternalFrame is active return the child which has focus.
Rectangle getNormalBounds() If the JInternalFrame is not in maximized state return getBounds(); otherwise return the bounds that the JInternalFrame would be restored to.
void restoreSubcomponentFocus() This method directs the internal frame to restore focus to the last subcomponent that had focus.
void setLayer(int) Convenience method for setting the layer attribute of this component.
void setNormalBounds(Rectangle) Sets the normal bounds for this frame the bounds that the frame would be restored to from its maximized state.

Changed Methods
void setVisible(boolean) Method was locally defined, but is now inherited from JComponent. Makes the component visible or invisible.