英语翻译The event sources don’t need to implement an interface or extend some class to be a source.However,they must keep a list of event listeners who have registered for events from this source.The listeners are registered with the source by
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![英语翻译The event sources don’t need to implement an interface or extend some class to be a source.However,they must keep a list of event listeners who have registered for events from this source.The listeners are registered with the source by](/uploads/image/z/14316209-17-9.jpg?t=%E8%8B%B1%E8%AF%AD%E7%BF%BB%E8%AF%91The+event+sources+don%E2%80%99t+need+to+implement+an+interface+or+extend+some+class+to+be+a+source.However%2Cthey+must+keep+a+list+of+event+listeners+who+have+registered+for+events+from+this+source.The+listeners+are+registered+with+the+source+by)
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