According to the requirements of the model, listener class and it's object will be created to register to the event source and realize the specific method in interface.
根据模型要求，要创建监听器类及其对象，完成向事件源的注册并实现接口中的特定方法。
According to the requirements of the model, listener class and it's object will be created to register to the event source and realize the specific method in interface.
根据模型要求，要创建监听器类及其对象，完成向事件源的注册并实现接口中的特定方法。
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