What is the point of a Java interface?
855
What does it mean to "program to an interface"?
112492
Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?
92138
Is the C# "explicit implementation" of the interface present in Java?
50083
Cast interface to its concrete implementation object or vice versa?
119009
What is an empty interface used for
100909
Difference between adding a unit to the interface or the implementation section
39482
Abstract, Interface, Classes OH MY - Question on Approach
85865
Optional Methods in Java Interface
48170
What is the purpose of a question mark after a type (for example: int? myVariable)?
132306
Java - Interface, instantiating an interface?
141803
The difference between the Runnable and Callable interfaces in Java
68987
What's the point of the Boolean object?
57860
Can we create an object of an interface?
150628
point of having an instance variable as final?
145649
What is the need of serialization in Java?
66575
Why use an interface in Apex?
23198
Why explicit interface implementation?