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Inheritance programing interview questions

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Inheritance programing interview questions Posted: Jan 12, 2015 11:48 PM
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This post originated from an RSS feed registered with Java Buzz by instanceof java.
Original Post: Inheritance programing interview questions
Feed Title: Instance Of Java
Feed URL: http://feeds.feedburner.com/blogspot/TXghwE
Feed Description: Instance of Java. A place where you can learn java in simple way each and every topic covered with many points and sample programs. 		Latest Java Buzz Posts
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1. what is the output of following program:

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

  5. public void show(){
  6.  
  7.   System.out.println("super class method called");
  8.  
  9. }
  10.  
  11. }

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

  4. public void show(){
  5.  
  6.   System.out.println("sub class method called");
  7.  
  8. }
  9.  public static void main(String args[]){
  10.  SubDemo subobj=new SubDemo();
  11.  subobj.show();
  12. }


Click for Output



2. what is the output of following program:

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

  5.  int x;

  7. }

  1. package com.instanceofjava;
  2. public class SubDemo{
  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. }


Click for Output

3. what is the output of following program:

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

  5.  int x;

  7. }

  1. package com.instanceofjava;
  2. public class SubDemo{
  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.x=2;
  17.  subobj.y=2;
  18.  subobj.show();
  19.  
  20. }


Click for Output

4. what is the output of following program:

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

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

  10. }
  11. }

  1. package com.instanceofjava;
  2. public class SubDemo{
  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. }


Click for Output


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