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

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

A class implementation of a method takes precedence over a default method. So, if the class already has the same method as an Interface, then the default method from the implemented Interface does not take effect. However, if two interfaces implement the same default method, then there is a conflict.

Can you extend two interfaces with the same name and signature default method?

Interfaces in Java are used to provide multiple inheritances. Classes can implement more than one interface. As interface can consist of default methods in Java 8, which a class does not necessarily need to implement. We can have two interfaces that have default methods with the same name and signature.

Can we implement 2 interfaces in Java?

Java does not support “multiple inheritance” (a class can only inherit from one superclass). However, it can be achieved with interfaces, because the class can implement multiple interfaces. Note: To implement multiple interfaces, separate them with a comma (see example below).

Can two interfaces have same name in Java?

If both interfaces have a method of exactly the same name and signature, the implementing class can implement both interface methods with a single concrete method.

Can we implement more than one interface in the same class?

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 a class implement two interfaces with same variable names?

14) A class cannot implement two interfaces that have methods with same name but different return type. 15) Variable names conflicts can be resolved by interface name.

Can we implement two interfaces?

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.

What would be the result if class extends two interfaces and both have method with same name and signature?

What would be the result if a class extends two interfaces and both have a method with same name and signature? Lets assume that the class is not implementing that method. Explanation: In case of such conflict, compiler will not be able to link a method call due to ambiguity. It will throw compile time error.

Does Java support multiple interfaces?

The Java programming language supports multiple inheritance of type, which is the ability of a class to implement more than one interface. An object can have multiple types: the type of its own class and the types of all the interfaces that the class implements.

CAN 2 interfaces have same method?

No, its an error If two interfaces contain a method with the same signature but different return types, then it is impossible to implement both the interface simultaneously. According to JLS (§8.4. 2) methods with same signature is not allowed in this case.

Can a class implement 2 interfaces?

Can you inherit from two interfaces with the same method name in both of them?

C# allows the implementation of multiple interfaces with the same method name.

What to do if a class implements two interface which coincidently have one method with the same name and signature?

Question 2: What to do if a class implements two interfaces which coincidently have one method with the same name and signature? Implement both interfaces implicitly. Implement at least one interface explicitly. A class cannot implement multiple interfaces.

How many interfaces can a class implement in Java?

But if you really really want to know the theoretical maximum number of interfaces a class can implement, it’s 65535.

Can we have more than 1 default interface?

Multiple Defaults With default functions in interfaces, there is a possibility that a class is implementing two interfaces with same default methods. The following code explains how this ambiguity can be resolved. First solution is to create an own method that overrides the default implementation.

How many interfaces can a class implement Java?

Can you inherit multiple interfaces?

No you cannot inherit multiple interfaces, because interfaces cannot be inherited. Interfaces are IMPLEMENTED, not inherited.

Can we extend multiple interfaces in Java?

An interface can extend other interfaces, just as a class subclass or extend another class. However, whereas a class can extend only one other class, an interface can extend any number of interfaces. The interface declaration includes a comma-separated list of all the interfaces that it extends.

Can two interfaces have same method?

If two interfaces contain a method with the same signature but different return types, then it is impossible to implement both the interface simultaneously. According to JLS (§8.4. 2) methods with same signature is not allowed in this case.

CAN interface have multiple methods?

Unless the class that implements the interface is abstract, all the methods of the interface need to be defined in the class. An interface can contain any number of methods.