What are some characteristics of interference class? -...

An interface class cannot give any code at all, but only the signature.
It may actualize a few interfaces.
All strategies for an Interface are unique.
An Interface Class cannot have occasion factors
An Interface Class’s perceptibility must be open (or) none.
In the event that we add another strategy to an Interface, at that point we need to find every one of the usages of the interface and characterize execution for the new technique
An Interface class cannot contain constructors
Interfaces are moderate as it requires additional indirection to discover comparing technique in the genuine class

What are some characteristics of interference class?