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JScrollPane(Component view, int vsbPolicy, int hsbPolicy)Creates a JScrollPane that displays the view  component in a viewport  whose view position can be controlled with a pair of scrollbars.VERTICAL_SCROLLBAR_NEVER,HORIZONTAL_SCROLLBAR_AS_NEEDED或者voidsetHorizontalScrollBarPolicy(int policy)          Determines when the horizontal scrollbar appears in the scrollpane.void   setVerticalScrollBarPolicy(int policy)          Determines when the vertical scrollbar appears in the scrollpane.

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