[英]Which class implements interface's method at runtime
如果在接口中聲明了一個方法（由許多類實現），則如何在運行時知道該方法使用哪種實現。
假設這是一個假設的問題，則可以在實例上使用getClass()方法來獲取實現類的具體類型。
但是您通常應該避免這樣做。 接口的整個想法是抽象其實現。
實現接口方法的類（沒有顯式實現該接口）是否擴展了該特定接口？
[英]Does a class which implements an interface's method (without explicitly implementing that interface) extend that specific interface?
如何在該接口類型的對象上調用實現接口的類中的方法？
[英]How can I call a method which is in a class which implements an Interface, on an object of that interface's type?
是否可以在實現接口的 class 中重載方法？
[英]Is it possible to overload a method in a class which implements an Interface?
如何在運行時從jar文件加載實現接口的類？
[英]How to load a class which implements a interface from a jar file at runtime?
如何通過接口從實現接口的類調用方法？
[英]How to call a method from a class which implements an interface, through the interface?
擴展一個類（實現接口）並實現相同的接口，不需要在類中定義方法？
[英]Extends a class(which implements interface) and implements same interface doesn't require method defination in class?
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