What do you mean by an interface in Java?
An interface in the Java programming language is an abstract type that is used to specify a behavior that classes must implement. They are similar to protocols. A class that implements an interface must implement all of the non-default methods described in the interface, or be an abstract class.
When should we use interface in Java?
Consider using interfaces if :
- You expect that unrelated classes would implement your interface.
- You want to specify the behaviour of a particular data type, but not concerned about who implements its behaviour.
- You want to take advantage of multiple inheritance of type.
What is public interface in Java?
An interface is a reference type in Java. It is similar to class. 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.
Can interface implement 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.
What is interface example?
An interface is a description of the actions that an object can do… for example when you flip a light switch, the light goes on, you don’t care how, just that it does. In Object Oriented Programming, an Interface is a description of all functions that an object must have in order to be an “X”.
What is the interface of a computer?
In computing, an interface is a shared boundary across which two or more separate components of a computer system exchange information. The exchange can be between software, computer hardware, peripheral devices, humans, and combinations of these.
Can an interface extend another interface?
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.
Why interface is required?
These interactions between your system and others are interfaces. Identifying interfaces helps you to define your system’s boundaries. Indentifying interfaces helps you ensure compatibility between your system and other systems you need to interact with.
Can interface be abstract in Java?
The interface body can contain abstract methods, default methods, and static methods. An abstract method within an interface is followed by a semicolon, but no braces (an abstract method does not contain an implementation).
What is default interface Java?
To overcome this issue, Java 8 has introduced the concept of default methods which allow the interfaces to have methods with implementation without affecting the classes that implement the interface. Default methods are also known as defender methods or virtual extension methods.
WHAT IS interface in Java with real time example?
An interface in java it has static constants and abstract methods only. for real time example – it is 100% abstraction. example is, Comparator Interface. If a class implements this interface, then it can be used to sort a collection.