Interfaces can be used to implement the Inheritance relationship between the non-related classes that do not belongs to the same hierarchy, i.e. any Class and any where in hierarchy.  Using Interface, you can specify what a class must do but not how it does.

1. A class can implement more than one Interface.
2. An Interface can extend one or more interfaces, by using the keyword extends.
3. All the data members in the interface are public, static and Final by default.
4. An Interface method can have only Public, default and Abstract modifiers…. More