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Does an interface extend or implement another interface?
An interface can extend other interfaces, just as a class subclass or extend another class.
Can you use extends for interface?
Classes cannot extend an Interface . They can only implement them. Only an Interface can extend another Interface just like only a Class can extend another Class .
What happens if an interface extends another interface?
An interface can extend another interface in the same way that a class can extend another class. The extends keyword is used to extend an interface, and the child interface inherits the methods of the parent interface.
Can an interface inherit another class?
Interfaces can inherit from one or more interfaces. The derived interface inherits the members from its base interfaces. A class that implements a derived interface must implement all members in the derived interface, including all members of the derived interface’s base interfaces.
What does it mean to extend an interface?
extends keyword
An interface can extend another interface in the same way that a class can extend another class. The extends keyword is used to extend an interface, and the child interface inherits the methods of the parent interface. The following Sports interface is extended by Hockey and Football interfaces.
Can interface implement the other interface?
Implements denotes defining an implementation for the methods of an interface. However interfaces have no implementation so that’s not possible. An interface can however extend another interface, which means it can add more methods and inherit its type.
Can We instantiate the interface?
You can’t instantiate an interface, but you can instantiate a class that implements the interface, then reference the implementing class as if it were the interface (which is the power of interfaces). A common example is the collections framework. We have java.util.List which is an interface.
Can an interface be final?
An interface cannot be final, because the implementation of such a class could never be completed. If I can write create static inner classes in interface I can provide implementation in it so why is such restriction.
Can interface inherit from a class?
Interface inheritance refers to an interface inheriting from one or more other interfaces. A notable difference from class inheritance is that while a class can only directly inherit from one other class, an interface can inherit from multiple interfaces.