![]() ![]() A class that implements an interface must implement all the methods declared in the interface. It provides total abstraction means all the methods in an interface are declared with the empty body, and all the fields are public, static and final by default. It can be used to achieve loose coupling.Īn interface is declared by using the interface keyword. Only the class that implements the interface can implement the methods. In this case the extending interface inherits all of the operations of the extended interface.By interface, we can support the functionality of multiple inheritance.There are mainly three reasons to use interface. To access the interface methods, the interface must be 'implemented' (kinda like inherited) by another class with the implements keyword (instead of extends). You can think List means that in this List all elements is of class Person or superclass of Person, so when you add Person class instance or subclass of Person class, the implicit casting will happen. Simply put, in Java, a class can inherit another class and multiple interfaces, while an interface can inherit other interfaces. The reason why you can do things above, Suppose there is a Person class, Student class extends Person. Since Java 9, we can have private methods in an interface. Overview One of the core principles of Object-Oriented Programming inheritance enables us to reuse existing code or extend an existing type. Since Java 8, we can have default and static methods in an interface. It cannot be instantiated just like the abstract class. ![]() ![]() As the generated class name is not necessarily normed or straight-forward, it is not nice to extend another JSP. This way the programmer is responsible for the implementation. In the JavaDoc it should then state something like 'to use this interface you need to extend from MyAbstractClass or provide your own implementation'. Java Interface also represents the IS-A relationship. The attribute extends (not extend) specifies a class that should implement the interface . The cleanest solution would be to define such a requirement in the JavaDoc of the interface. In other words, you can say that interfaces can have abstract methods and variables. It is used to achieve abstraction and multiple inheritance in Java. There can be only abstract methods in the Java interface, not method body. The interface in Java is a mechanism to achieve abstraction. As shown in the figure given below, a class extends another class, an interface extends another interface, but a class implements an interface. However, whereas a class can extend only one other class, an. It has static constants and abstract methods. An interface can extend other interfaces, just as a class subclass or extend another class. Why multiple inheritance is supported in Interface while it is not supported in case of class.Īn interface in Java is a blueprint of a class. ![]()
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