Can interface be used as reference type?

You can use interface names anywhere you can use any other data type name. If you define a reference variable whose type is an interface, any object you assign to it must be an instance of a class that implements the interface.

What is a interface reference?

An interface reference variable only knows that methods which are declared by its interface declaration. It does not allow accessing any other variables or methods that might be supported by the objects. This concept is similar when you use a parent class reference to access a child class object.

How do I create a reference type of an interface in Java?

We can’t create an instance(interface can’t be instantiated) of the interface but we can make the reference of it that refers to the Object of its implementing class. A class can implement more than one interface. An interface can extend to another interface or interface (more than one interface).

What is the use of interface reference variable in Java?

A reference variable can be declared as a class type or an interface type. If the variable is declared as an interface type, it can reference any object of any class that implements the interface.

What is an interface type?

An interface type is an abstract tagged type that provides a restricted form of multiple inheritance. A tagged type, task type, or protected type may have one or more interface types as ancestors.

What are the different types of UI?

The various types of user interfaces include:

  • graphical user interface (GUI)
  • command line interface (CLI)
  • menu-driven user interface.
  • touch user interface.
  • voice user interface (VUI)
  • form-based user interface.
  • natural language user interface.

Which is reference type?

Unlike value types, a reference type doesn’t store its value directly. Instead, it stores the address where the value is being stored. In other words, a reference type contains a pointer to another memory location that holds the data.

What is the meaning of reference type?

A reference type is a code object that is not stored directly where it is created, but that acts as a kind of pointer to a value stored elsewhere.

What is interface data type in Java?

An interface is a reference type in Java. It is similar to class. It is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface. Along with abstract methods, an interface may also contain constants, default methods, static methods, and nested types.