Why do we need interface while we can do the same with class itself?
855
What does it mean to "program to an interface"?
5983
Why Java needs Serializable interface?
27078
When do Java generics require  instead of  and is there any downside of switching?
92138
Is the C# "explicit implementation" of the interface present in Java?
116081
How can I refer to the class type a interface is implementing in Java?
31188
In Java when one interface extends another, why would one redeclare a method in a subinterface?
75499
Determine if a Class implements a interface in Java
103758
Why are interfaces not [Serializable]?
119009
What is an empty interface used for
139818
Why implement interface explicitly?
152816
Abstract base classes that implement an interface
75561
Comment the interface, implementation or both?
144204
Implementing the same interface at different generic instantiations
38390
Is there more to an interface than having the correct methods
147584
Performance difference between passing interface and class reloaded
27421
implicit operator using interfaces
45379
Why are interface variables static and final by default?