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Why Role Interface Inwards Coffee Or Object Oriented Programming

Many times, I possess got seen questions similar why should nosotros role interface inward Java, if nosotros tin give notice non define whatsoever concrete methods within interface? Or fifty-fifty to a greater extent than common, What is the existent role of interface inward Java? I tin give notice sympathise beginners quest this question, when they simply come across cite of the method within interface as well as zilch else. It takes fourth dimension to realize existent goodness or actual role of interface or abstraction inward Java or whatsoever object oriented programming. One argue of this is lack of sense inward actually modelling something existent inward computer program using object oriented analysis as well as design. In this article, I volition endeavour to response this inquiry as well as give you lot couple of argue to role interface inward your code. If you lot possess got expert agreement of Object oriented basics e.g. Polymorphism, as well as thence you lot know that it allows you lot to write flexible code. Interface or abstraction are telephone substitution to plough over polymorphism, when a caller role interface for calling a method, he innovate flexibility as well as dynamism inward code, every bit that code volition run alongside whatsoever implementation of that interface, non simply the introduce concrete implementation. You volition never going to teach this flexibility, if you lot role concrete classes for calling methods, nosotros volition come across this inward to a greater extent than details inward adjacent section. Also Programming for Interfaces, is likewise good recognized as well as ane of the key object oriented blueprint regulation for coding. Another role of interface inward Java is that, it opens novel opportunities for other goodies e.g. blueprint patterns. Lot's of blueprint patterns are heavily relied on interfaces as well as Polymorphism e.g. Decorator, Composite, Proxy or Adapter pattern, all implements same interface, every bit at that topographic point target, as well as because they are based on interfaces, they tin give notice survive used interchangeably.

Use Interface for Flexibility as well as Polymorphism

As I said, polymorphism is powerful as well as provides flexibility as well as dynamic demeanour to your code. In fellowship to convey role of Polymorphism, you lot tin give notice either role interface or abstract class inward Java. Interface provides highest marker of abstraction. For instance next code, which is based on interfaces, as well as an instance of programming to interface than implementation principle, is flexible plenty to run alongside whatsoever Map implementation inward Java.

Map cache = CacheFactory.getCach(); Employee emp = cache.get("EmployeeID");  // this trace depends upon interface Map, rather than concrete class e.g. HashMap

If you lot expect closely, you lot volition honor that, nigh of the fourth dimension nosotros role methods from interface. For example, hither nosotros are using get() method from Map interface, you lot could definitely write next code inward price of HashMap or Hashtable, but as well as thence you lot switched to closed to other implementation e.g. ConcurrentHashMap, you lot demand to alter your code. Here, nosotros are using Map interface for getting Employee object from Cache, which tin give notice survive whatsoever valid Map implementation, including HashMap, Hashtable, or ConcurrentHashMap. On similar line, you lot should role interface every bit Type of method arguments as well as every bit render type. This makes your code flexible plenty to operate on whatsoever implementation.

Use Interface inward Java to adapt Design patterns

If you lot are familiar of famous GOF blueprint patterns than you lot know that nigh of the behavioural pattern role Polymorphism for dynamic behaviour, e.g. Decorator pattern, implements same interface every bit the object, which it decorates. If you lot don't role interface, it would survive impossible to contain blueprint patterns e.g. if your method possess got concrete type, rather than abstract type, as well as thence you lot tin give notice non transcend anything else to them. You non alone lose flexibility but likewise runtime demeanour enrichment. Similarly, Composite pattern likewise uses same interface every bit object it contains, as well as this allows caller to bargain alongside a normal object or composite object inward same way, had they don't role interface, it wasn't possible. Proxy as well as Adapter blueprint pattern likewise relies on higher bird abstraction e.g. interface or abstract class, to render added behaviour. In short, interface is non simply a expert coding practice, it likewise opened upwards path to contain other best practices inward your code.

Use Interface to assist Unit Testing

Testing is a big job organisation for whatsoever Project. Project Managers, Technical Pb as well as developers volition e'er prefer a code which tin give notice survive unit of measurement tested easily inward isolation alongside other moving parts. When nosotros role interfaces inward our code, our method starting fourth dimension depending upon interfaces than implementation, which makes unit of measurement testing extremely easy. For example, a code which is using Database tin give notice non survive tested inward isolation, until  database is available, but if same code is using interface to interact alongside database layer (DAO blueprint pattern), you lot tin give notice e'er render a dummy or mock object to mimic database calls. By using interface inward your code, you lot teach flexibility everywhere.


That's all on why you lot should role interface inward Java. Though you lot tin give notice non define concrete methods, it's best means to innovate abstraction inward your design. Real role of interface is to amend code character past times allowing modules to depend upon higher bird of abstraction, which is less probable to alter than lower bird concrete classes, which is to a greater extent than probable to change. Use of interface likewise opens opportunities for using tried as well as tested Java blueprint pattern as well as immensely helps inward Unit testing every bit well. Most importantly, role of interface volition give you lot dissimilar bird of thinking as well as in all probability it's ane measuring inward mastering object oriented analysis as well as design.

Further Learning
SOLID Principles of Object Oriented Design
Absolute Introduction to Object Oriented Programming inward Java
Java - Object Oriented Programming [For Absolute Beginners]

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