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监听器Listener解析与实例

监听器-就是一个实现待定接口的普通Java程序,此程序专门用于监听另外一个类的方法调用。 这是使用观察者模式的。

什么是观察者模式: 定义对象间一对多的依赖关系,当一个对象的状态发生改变时,所有依赖于它的对象都得到通知自动更新。 示例: GUI编程中的addXxxxListener都是观察者模式。 比如为按钮点击添加监听事件,为键盘添加监听等等…

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