Program to implement the following Multiple Inheritance using interface

In multiple inheritance there are several super classes for a subclass. Java does not support Multiple inheritance. To achieve multiple inheritance in Java you have to use interface. The syntax for it is given below:
interface   <interface-name> {
    // variable declarations
 // Method declarations (no implementation)

The implements keyword is used to for implementing interface and extends keyword is used to extend the class. The syntax for extending class and implementing interface is:
class   <subclass-name>   extends   <superclass-name>   implements   <interface-name> {

 // Body of subclass

In this program, we have created an interface Exam which has one method percent_cal( ) without implementation (body). Then we declare the class Student having data members name, roll_no, marks1, marks2 and one method display( ). Finally we extend the Student class and implement the Exam interface in Result class. You must override all the methods which a interface contains.

import java.lang.*;

interface Exam {
 void percent_cal();

class Student {
 String name;
 int roll_no,mark1,mark2;
 Student(String n, int r, int m1, int m2) {
 void display() {
  System.out.println ("Name of Student: "+name);
  System.out.println ("Roll No. of Student: "+roll_no);
  System.out.println ("Marks of Subject 1: "+mark1);
  System.out.println ("Marks of Subject 2: "+mark2);

class Result extends Student implements Exam {
 Result(String n, int r, int m1, int m2) {
 public void percent_cal() {
  int total=(mark1+mark2);
  float percent=total*100/200;
  System.out.println ("Percentage: "+percent+"%");
 void display() {

public class MultipleInh {

 public static void main(String[] args) {
  Result R = new Result("Ragini",12,93,84);
C:\>java MultipleInh
Name of Student: Ragini
Roll No. of Student: 12
Marks of Subject 1: 93
Marks of Subject 2: 84
Percentage: 88.0%


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