Java Default Method Example

Static Methods inside Java 8 Interface

package java8;

public interface Shape {

           

            default void rectArea(float l,float w)

            {

                        System.out.println("AreaofRectangle="+(l*w));

            }

           

            public static void staticMethod()

            {

                        System.out.println("we can declared inside interface static and default method in jdk 8");

            }

           

           

            public void area();

}

package java8;

import java.util.Scanner;

public class Circle implements Shape{

            @Override

            public void area() {

                        float r;

                        System.out.println("enter radius");

                        Scanner s1=new Scanner(System.in);

                        r=s1.nextFloat();

                        System.out.println("Area of circle="+(3.14f*r*r));

            }

}

import java.util.Scanner;

public class Triangle  implements Shape{

           

            public void area() {

                        float a,b;

                        System.out.println("enter a and b value");

                        Scanner s1=new Scanner(System.in);

                        a=s1.nextFloat();

                        b=s1.nextFloat();

                        System.out.println("Area of Triangle="+(0.5f*a*b));

            }

}

package java8;

public class ShapeMain {

            public static void main(String[] args) {

                        Circle c1=new Circle();

                        Triangle t1=new Triangle();

                        c1.area();

                        t1.area();

                        c1.rectArea(4.5f, 4.5f);//calling default method of interface

                        Shape.staticMethod();//calling static method of interface

            }

}

o/p:-----------------------------------

enter radius

3

Area of circle=28.26

enter a and b value

2

3

Area of Triangle=3.0

AreaofRectangle=20.25

we can declared inside interface static and default method in jdk 8