Only this time, you nest another container inside of the panel: a JScrollPane.

但是，这一次在这个面板中嵌套另一个容器：JScrollPane。

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The JScrollPane component even comes with a pre-registered listener, so the pane will scroll when it has focus and the user moves the wheel.

JScrollPane组件甚至随预注册的侦听器一起提供，所以当这个组件获得焦点且用户移动鼠标滚轮时窗格将会滚动。

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