OOPs
Java Program to Demonstrate Interface
A Java program to demonstrate the usage of interfaces.
Problem Description
Write a Java program to demonstrate the concept of interfaces.
Code
interface Polygon {
void getArea(int length, int breadth);
}
class Rectangle implements Polygon {
public void getArea(int length, int breadth) {
System.out.println("The area of the rectangle is " + (length * breadth));
}
}
public class InterfaceExample {
public static void main(String[] args) {
Rectangle r1 = new Rectangle();
r1.getArea(5, 6);
}
}Output
The area of the rectangle is 30Explanation
- Interface: A completely abstract class. All methods are public and abstract by default.
implements: Used by a class to inherit from an interface.- Multiple Inheritance: Java supports multiple inheritance through interfaces.