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observableButton

observableButton

observableButton

observableButton

1

The revised declaration of observableButton actually creates an anonymous class in which we override the click method , as before .

修订过的 observableButton 的声明实际上创建了一个匿名类，并且像之前那样重写了 click 方法。

2

The expected observer count is 1 . The observableButton is declared as follows .

观察者的计数应该是 1 。observableButton 有下面的语句声明，

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