Can a class inherit from another class and an interface?

Can a class inherit from another class and an interface?

Also, it is possible for a java interface to inherit from another java interface, just like classes can inherit from other classes. A class implementing an interface which inherits from multiple interfaces must implement all methods from the interface and its parent interfaces. An example is given below.

Can we inherit child class from 2 base classes?

In Multiple inheritance, one class can have more than one superclass and inherit features from all its parent classes. But C# does not support multiple class inheritance.

Can an interface inherit base class?

An interface can’t be instantiated directly. Its members are implemented by any class or struct that implements the interface. A class or struct can implement multiple interfaces. A class can inherit a base class and also implement one or more interfaces.

CAN 2 interface 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 (ยง8.4. 2) methods with same signature is not allowed in this case.

CAN 2 interfaces have same method names?

The implementation of interface’s members will be given by the class who implements the interface implicitly or explicitly. C# allows the implementation of multiple interfaces with the same method name.

How can we implement two interfaces in one class?

A class can implement multiple interfaces. In Java, interfaces are declared using the interface keyword. All methods in the interface are implicitly public and abstract. To use an interface in your class, append the keyword “implements” after your class name followed by the interface name.

How many interface can a class implement?

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 an interface extend 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.

Is interface inherited?

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 interface contain constant?

It’s possible to place widely used constants in an interface. If a class implements such an interface, then the class can refer to those constants without a qualifying class name. This is only a minor advantage.

How do you implement a nested interface?

Example of nested interface which is declared within the class

  1. class A{
  2. interface Message{
  3. void msg();
  4. }
  5. }
  6. class TestNestedInterface2 implements A.Message{
  7. public void msg(){System.out.println(“Hello nested interface”);}
  8. public static void main(String args[]){

Can we have interface inside interface?

Yes, we can do it. The definition of the nested interface in java is as follows: A nested interface is any interface whose declaration occurs within the body of another class or interface. A top-level interface is an interface that is not a nested interface.

Is an interface a type?

is a type, just as a class is a type. Like a class, an interface defines methods. Unlike a class, an interface never implements methods; instead, classes that implement the interface implement the methods defined by the interface. A class can implement multiple interfaces.

What can be declared inside interface declaration?

Inner interface modifiers The keywords public, abstract, and static can be used in the declaration of a nested top-level interface. If a nested top-level interface is declared public, it is accessible from any class or interface that can access the enclosing class.

What is inside interface in Java?

An interface which is declared inside another interface or class is called nested interface. They are also known as inner interface. Since nested interface cannot be accessed directly, the main purpose of using them is to resolve the namespace by grouping related interfaces (or related interface and class) together.

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