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Practical-28

Write a java program which implements Multiple Interfaces.​

Introduction​

Writing a java program which implements Multiple Interfaces is a way of enabling a class to implement different interfaces at the same time and defining multiple behavior for the same class. This is often needed when a class needs to fulfill more than one function, as only one parent is allowed for inheritance.

Code​

interface Interface1 {
    public void method1(String str);
}

interface Interface2 {
    public void method2();
}

interface Interface3 {
    public void method3();
}

class DemoClass implements Interface1, Interface2, Interface3 {
    public void method1(String str) {
        System.out.println("Implementation of method1:"+str);
    }

    public void method2() {
        System.out.println("Implementation of method2");
    }

    public void method3() {
        System.out.println("Implementation of method3");
    }
}

public class Main {
    public static void main(String args[]) {
        DemoClass myObj = new DemoClass();
        myObj.method1("multiple interfaces");
        myObj.method2();
        myObj.method3();
    }
}

Output​

Implementation of method1:multiple interfaces
Implementation of method2
Implementation of method3
Explanation

This code creates three interfaces and a class DemoClass which implements all the three interfaces. The main method creates an object of DemoClass class and then call all three methods of the respective interfaces.