Why do you have to define methods in the class rather than the interface?
855
What does it mean to "program to an interface"?
112804
Java Interface Usage Guidelines -- Are getters and setters in an interface bad?
141587
Is there any reason to declare optional parameters in an interface?
75006
Is there a way to prevent a method from being overridden in subclasses?
6853
Interface vs Abstract Class (general OO)
35653
Should methods in a Java interface be declared with or without a public access modifier?
33679
Why should the interface for a Java class be preferred?
11736
When should I use a struct rather than a class in C#?
156253
Why is a method not identical to itself?
848
Why can't I define a static method in a Java interface?
27022
The difference between Classes, Objects, and Instances
66575
Why use an interface in Apex?
131669
Why Would I Ever Need to Use C# Nested Classes
24005
Setting methods through prototype object or in constructor, difference?
45659
What is the difference between Class.this and this in Java
69594
What is the difference between an interface and abstract class?
37713
Why can't static methods be abstract in Java?