INTERFACE IN JAVA
In the Java programming language, an interface is an abstract type that specifies a class's behaviour.
- In Java, an interface is a blueprint for a class. Static constants and abstract methods are found in a Java interface.
- An interface is a completely "abstract class" that is used to group related methods with empty bodies
- The interface keyword is used to declare an interface.
- The Java interface can only have abstract methods, not method bodies. In Java, it is used to achieve abstraction as well as multiple inheritance.
Definition of interface:
Defining an interface is similar to class. To create an interface, we use the keyword interface. An interface can extend any number of interfaces.
Syntax:
Interface intname
{
//constant fields
// methods and abstract
//by default
}
Example:
interface bike
{
int speed = 50;
public void showbike();
}
interface car
{
int speed = 65;
public void showcar();
}
class vehicle implements bike, car
{
public void showbike()
{
System.out.println(“Bike speed: “ + speed);
}
public void showcar()
{
System.out.println(“Car speed: “ + speed);
}
public static void main(String as[])
{
Vehicle V = new Vehicle();
V.showbike();
V.showcar();
}
}
Output:
Bike speed: 50
Car speed: 65
