Can an interface have multiple implementations?

Can an interface have multiple implementations?

Yes, we can do it. An interface can extend multiple interfaces in Java.

How many implementations can an interface have?

Your class can implement more than one interface, so the implements keyword is followed by a comma-separated list of the interfaces implemented by the class. By convention, the implements clause follows the extends clause, if there is one.

Can Java implement multiple interfaces?

A Java class can implement multiple Java Interfaces. It is necessary that the class must implement all the methods declared in the interfaces. The class cannot implement two interfaces in java that have methods with same name but different return type.

Can we have multiple default methods in interface?

Multiple Defaults With default functions in interfaces, there is a possibility that a class is implementing two interfaces with same default methods. First solution is to create an own method that overrides the default implementation.

Which allows you define one interface and have multiple implementations?

Polymorphism is considered one of the important features of Object-Oriented Programming. Polymorphism allows us to perform a single action in different ways. In other words, polymorphism allows you to define one interface and have multiple implementations.

Can an interface extend another class?

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.

What happens if a class implement 2 interfaces having same method?

7 Answers. If a type implements two interfaces, and each interface define a method that has identical signature, then in effect there is only one method, and they are not distinguishable. If, say, the two methods have conflicting return types, then it will be a compilation error.