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Inheritance interview programming questions : Part 2

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Inheritance interview programming questions : Part 2 Posted: Feb 15, 2016 11:38 AM
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This post originated from an RSS feed registered with Java Buzz by instanceof java.
Original Post: Inheritance interview programming questions : Part 2
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 show() 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 show() method called");
  7.  
  8. }
  9.  public static void main(String args[]){
  10.  
  11. SuperDemo supobj= new SuperDemo();
  12.  supobj.show(); 
  13.  
  14. }
  15. }



Click for Output


2. 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 show() 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 show() method called");
  7.  
  8. }
  9.  public static void main(String args[]){
  10.  
  11. SuperDemo supobj= new SuperDemo();
  12.  supobj.show(); 
  13.  
  14.  SubDemo subobj=new SubDemo();
  15.  subobj.show();
  16.  
  17.  }
  18. }


Click for Output


3. 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 show() 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 show() method called");
  7.  
  8. }
  9.  public static void main(String args[]){
  10.  
  11. SuperDemo supobj= new SubDemo();
  12. supobj.show(); 
  13.  
  14. }
  15. }


Click for Output


4. 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 show() method called");
  8.  
  9. }
  10.  
  11.  public void superMethod(){
  12.  
  13.         System.out.println("Super class superMethod() called");
  14.  
  15. }
  16.  
  17. }

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

  4. public void show(){
  5.  
  6.  System.out.println("Sub class show() method called");
  7.  
  8. } 
  9.  
  10. public void subMethod(){
  11.         System.out.println("Sub class subMethod() called");
  12. }

  14.  public static void main(String args[]){
  15.  
  16. SuperDemo supobj= new SubDemo();
  17. supobj.superMethod();
  18.  
  19. // supobj.subMethod();  // compile time error: The method subMethod() is undefined for the
  20. type Super

  22.  ((SubDemo)supobj).subMethod();
  23. ((SuperDemo)supobj).show();
  24. }
  25. }


Click for Output




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