【单选题】【消耗次数：1】
下列说法中错误的是（ ）。
①
同一个对象可以监听一个事件源上多个不同的事件
②
一个类可以实现多个监听器接口
③
一个类中可以同时出现事件源和事件处理者
④
一个类只能实现一个监听器接口
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