Why use interfaces to develop Java applications?
It is advisable to design relatively large applications using interfaces because it makes the whole system easier to modify, extend and integrate new features. To start with, you may only have one implementation of a given interface, but if you find you need slightly different behaviour in special circumstances, you only need write a class that conforms to one of the existing interfaces and it will drop in place without major modifications. Interfaces also allow you to adapt a class from a different hierarchy to work in an existing application. The class only needs to declare it implements the interface, provide the necessary methods and it can be integrated directly as if it were created for the job. Actions: Follow-up, clarify or correct this answer. Submit a new question.
It is advisable to design relatively large applications using interfaces because it makes the whole system easier to modify, extend and integrate new features. To start with you may only have one implementation of a given interface, but if you find you need slightly different behaviour in special circumstances, you only need write a class that conforms to one of the existing interfaces and it will drop in place without major modifications. Interfaces also allow you to adapt a class from a different hierarchy to work in an existing application. The class only needs to declare it implements the interface, provide the necessary methods and it can be integrated directly as if it were created for the job. Actions: Follow-up or correct this answer. Submit a new question.
