» » Inheritance programming interview questions

1. what is the output of following program:

  1. package com.instanceofjava;
  2.  
  3. public class SuperDemo{

  4. public void show(){
  5.  
  6.   System.out.println("super class method called");
  7.  
  8. }
  9.  
  10. }

  1. package com.instanceofjava;
  2. public class SubDemo extends SuperDemo{

  3. public void show(){
  4.  
  5.   System.out.println("sub class method called");
  6.  
  7. }
  8.  public static void main(String args[]){
  9.  SubDemo subobj=new SubDemo();
  10.  subobj.show();
  11. }







2. what is the output of following program:

  1. package com.instanceofjava;
  2.  
  3. public class SuperDemo{

  4.  int x;

  5. }

  1. package com.instanceofjava;
  2. public class SubDemo extends SuperDemo{
  3.  
  4.  int y;
  5.  
  6. public void show(){
  7.  
  8.  super.x=y+2;
  9.   System.out.println("x="+super.x+"y="+y);
  10.  
  11. }
  12.  
  13.  public static void main(String args[]){
  14.  
  15.  SubDemo subobj=new SubDemo();
  16.  subobj.show();
  17.  
  18. }




3. what is the output of following program:

  1. package com.instanceofjava;
  2.  
  3. public class SuperDemo {

  4.  int x;

  5. }

  1. package com.instanceofjava;
  2.  
  3. public class SubDemo extends SuperDemo{
  4.  
  5.  int y;
  6.  
  7. public void show(){
  8.  
  9.  super.x=y+2;
  10.   System.out.println("x="+super.x+"y="+y);
  11.  
  12. }
  13.  
  14.  public static void main(String args[]){
  15.  
  16.  SubDemo subobj=new SubDemo();
  17.  subobj.x=2;
  18.  subobj.y=2;
  19.  subobj.show();
  20.  
  21. }




4. what is the output of following program:

  1. package com.instanceofjava;
  2.  
  3. public class SuperDemo{

  4.  int x;
  5. SuperDemo(){
  6.  
  7.  x=24;

  8. }
  9. }

  1. package com.instanceofjava;
  2. public class SubDemo extends SuperDemo{
  3.  
  4.  int y;
  5.  
  6. public void show(){
  7.  
  8.   System.out.println("x="+super.x);
  9.   System.out.println("y="+y);
  10.  
  11. }
  12.  
  13.  public static void main(String args[]){
  14.  
  15.  SubDemo subobj=new SubDemo();
  16.  subobj.show();
  17.  
  18. }





Instance Of Java

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