Is it common to declare variables of interface type instead of implement it?
855
What does it mean to "program to an interface"?
17625
Implementing multiple interfaces having same method
50570
When to use an interface instead of an abstract class and vice versa?
24637
Why can't two methods be declared with the same signature even though their return types are different?
137841
Private Interfaces
130617
Declaring a single type - "using" equivalent for single type
100925
Does an interface by default extend Object?
77713
Convert variable to type only known at run-time?
31188
In Java when one interface extends another, why would one redeclare a method in a subinterface?
1765
How to get interface basetype via reflection?
34170
Is it possible to use a primitive type (int) in as a generic type in Java?
33679
Why should the interface for a Java class be preferred?
32263
C# Interfaces. Implicit implementation versus Explicit implementation
69315
Should you always Code To Interfaces In Java
105030
When to use: Java 8+ interface default method, vs. abstract method
123041
Does the order of declaration matter in Java/C#?
5607
How do you declare an interface in C++?