The Alternative class provides methods for the three types of event-selection strategy.

alternative类为三种事件选择策略提供了方法。

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The method select() of the Alternative class corresponds to an arbitrary selection strategy.

Alternative类的select()方法对应着任意选择策略。

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The method select() of the Alternative class corresponds to an arbitrary selection strategy.

Alternative类的select()方法对应着任意选择策略。

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