Briefly - the same thing as in other languages. Interface declares which methods (or properties) are available for you if use object implementing the interface. If you implement the interface, compiler check if you have implemented all methods (properties) from the interface. Interfaces allows you rely on object's functionality (messages you can send to it) rather than on a object's type. If you use interfaces, you can also avoid inheritance, which has not to be necessary the best approach.
1 answers
Briefly - the same thing as in other languages.
Interface declares which methods (or properties) are available for you if use object implementing the interface.
If you implement the interface, compiler check if you have implemented all methods (properties) from the interface.
Interfaces allows you rely on object's functionality (messages you can send to it) rather than on a object's type. If you use interfaces, you can also avoid inheritance, which has not to be necessary the best approach.
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