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What does Interface consist of in Java
An interface can be defined using the interface keyword. It contains variables and methods like a class but the methods in an interface are abstract by default unlike a class. An interface is primarily used to implement abstraction and it cannot be instantiated.
A program that demonstrates an interface in Java is given as follows:
Example
interface AnimalSound {
abstract void sound();
}
class CatSound implements AnimalSound {
public void sound() {
System.out.println("Cat Sound: Meow");
}
}
class DogSound implements AnimalSound {
public void sound() {
System.out.println("Dog Sound: Bark");
}
}
class CowSound implements AnimalSound {
public void sound() {
System.out.println("Cow Sound: Moo");
}
}
public class Demo {
public static void main(String[] args) {
AnimalSound a = new CatSound();
a.sound();
}
}Output
Cat Sound: Meow
Updated on: 30-Jul-2019
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