Can one interface inherit from another?

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.

Can interface inherit from another interface?

An interface can extend any number of interfaces but one interface cannot implement another interface, because if any interface is implemented then its methods must be defined and interface never has the definition of any method.

Can I inherit one interface from another interface if yes how if no why?

It is certainly possible to have an inheritance tree of interfaces, and even «multiple inheritance» with interfaces.

Can an interface inherit a class?

An interface can inherit multiple interfaces but cannot inherit a class. An abstract class can inherit a class and multiple interfaces. An interface cannot declare constructors or destructors.

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Can we inherit multiple interfaces?

An interface contains variables and methods like a class but the methods in an interface are abstract by default unlike a class. Multiple inheritance by interface occurs if a class implements multiple interfaces or also if an interface itself extends multiple interfaces.

Can an interface have a constructor?

No, you cannot have a constructor within an interface in Java. You can have only public, static, final variables and, public, abstract, methods as of Java7.

Which keyword is used to inherit one interface from another interface?

Definition and Usage

The interface keyword is used to declare a special type of class that only contains abstract methods. To access the interface methods, the interface must be «implemented» (kinda like inherited) by another class with the implements keyword (instead of extends ).

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 is the difference between interface and inheritance?

Inheritance is the mechanism in java by which one class is allowed to inherit the features of another class. Interface is the blueprint of the class. … Like a class, an interface can have methods and variables, but the methods declared in an interface are by default abstract (only method signature, no body).

Can an interface implement a class?

To declare a class that implements an interface, you include an implements clause in the class declaration. 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.

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Can an interface extend an abstract class?

Thus, if a class already has a different superclass, it can implement an interface, but it cannot extend another abstract class. Therefore interfaces are a more flexible mechanism for exposing a common interface. If you need to separate an interface from its implementation, use an interface.

Can abstract class inherit another class?

Sure, an abstract class can inherit from another class!! The only time a class cannot inherit from another is when the class you wish to inherit from is sealed or has private constructors only.

Can abstract class have constructor?

The constructor inside the abstract class can only be called during constructor chaining i.e. when we create an instance of sub-classes. This is also one of the reasons abstract class can have a constructor.

What happens if two interface have same method name?

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.

Why interface is used for multiple inheritance?

As we have explained in the inheritance chapter, multiple inheritance is not supported in the case of class because of ambiguity. However, it is supported in case of an interface because there is no ambiguity. It is because its implementation is provided by the implementation class.

Why C Sharp does not support multiple inheritance?

C# does not support multiple inheritance , because they reasoned that adding multiple inheritance added too much complexity to C# while providing too little benefit. In C#, the classes are only allowed to inherit from a single parent class, which is called single inheritance .