For example, there is also a SelectionAdapter class that implements SelectionListener.

例如，还有一个selectionadapter类，这个类实现了SelectionListener。

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The constructor for the SelectionListener implementation accepts a Boolean variable that defines whether the tree items are to be expanded or collapsed, depending on which button is selected.

SelectionListener 实现的构造函数接受一个布尔变量，该变量定义要展开还是折叠树项目，具体取决于选中了哪个按钮。

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