Question

What is the output for the following program codes?

a)                                                                                                        [ 0.5 Mark ]

     class A {

     int i;

       }

     class B extends A {

     int j;

     void display() {

     super.i = j + 1;

     System.out.println(j + " " + i); }}

     class inheritance {

     public static void main(String args[]) {

     B obj = new B();

     obj.i=1;

     obj.j=2;

     obj.display(); }}

OUTPUT:

b)                                                                                                        [ 0.5 Mark ]

     class Parent {

                public void getBike(){

                               System.out.println("Suzuki Bike");

     }}

     class Child extends Parent {

                public void getCar(){

                               System.out.println("Swift car"); }}

     class inheritance {

     public static void main(String args[]) {

     Parent p = new Parent();

     p.getBike();

     Child c = new Child();

     c.getBike();

     c.getCar(); }}

OUTPUT:

Answer 1

a) 2 3

Explanation: After declaration of obj, we assigned values i = 1 and j = 2. But when we call display, we are updating i value as super.i = j+1 = 2 + 1 = 3. As class B inherits i from A, it prints i values as 3. So, output is 2 3

b)

Suzuki Bike
Suzuki Bike
Swift car

Explanation: Parent p calls getbike(), which displays "Suzuki Bike". Child c also calls getBike(), which inherited getBike() method from Parent, it also prints "Suzuki Bike". Then Child c call getCar() method which prints "Swift car"