Wipro-inheritance

In order to restrict a variable of a class from inheriting to a subclass, how variable should be declared?

• Private

• Protected

• Public

• Both private and public

A class member declared protected becomes member of subclass of which type?

• protected member

• private member

• static member

• public member

What will be the output of the following?

class A

{

public int i;

private int j;

}

class B extends A

{

void display()

{

super.j=super.i+1;

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

}

}

class inheritance

{

Public static void main(String args[])

{

      B obj=newB();

obj.i=1;

obj.j=2;

obj.display();

}

}

• 2 2

•   3 3

• Runtime error

• Compilation error

    Determine the output

Class A{

public void printName(){

System.out.println("Name-A");

}

}

class B extendsA{

public oid printName(){

System.out.println("Name-B");

}

}

class C extendsA{

public void printName(){

System.out.println("Name-C");

}

}

public class Test{

public static void main (String[] args){

             B b=new B();

             C c=new C();

            b = c;

newPrint(b);

}

public static void newPrint(A a){

a.printName();

}

}

• Name-B

• Compilation error

• Run time error

• Name-A

Inheritance relationship in Java language is

• Association

• Is-A

• Has-A

• None

   What is the output of this program?

class A

{

public int i;

protected int j;

}

class B extends A

{

int j;

void display()

{

super.j=3;

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

}

}

class Output

{

public static void main(String args[])

{

            B obj=new B();

obj.i=1;

obj.j=2;

obj.display();

}

}

• 1 2

• 2 1

• 1 3

• 3 1

What is the result of compiling and running the following code?

class Base{

public Base(){

System.out.print("Base");

}

}

public class Derived extends Base{

public Derived(){

this("Exam veda");

System.out.print("Derived");

}

public Derived(String s){

System.out.print(s);

}

public static void main(String[] args){

new Derived();

}

}

• Exam veda Derived

• Exam veda Base Derived

• Base Exam veda Derived

• Exam veda Derived Base

8)The concept of multiple inheritance is implemented in Java by

The concept of multiple inheritance is implemented in Java by

I.   Extending two or more classes.
II.  Extending one class and implementing one or more interfaces.
III. Implementing two or more interfaces.

• only I

• only II

• II and III

• only III

The output of the following code is:

class Small{

public Small(){

System.out.print("a ");

}

}

class Small2 extends Small{

publicSmall2(){

System.out.print("b ");

}

}

classSmall3extendsSmall2{

public Small3(){

System.out.print("c ");

}

}

public class Test{

public static void main(String args[]){

new Small3();

}

}

• a

• c

• a b c

• c b a

A subclass inherits all the members (fields, methods, and nested classes) from its superclass

• Yes

• No

• Can be say yes or no

• cannot say