» » » Inheritance interview programming questions : Part 2

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 show() 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 show() method called");
  6.  
  7. }
  8.  public static void main(String args[]){
  9.  
  10. SuperDemo supobj= new SuperDemo();
  11.  supobj.show(); 
  12.  
  13. }
  14. }






2. 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 show() 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 show() method called");
  6.  
  7. }
  8.  public static void main(String args[]){
  9.  
  10. SuperDemo supobj= new SuperDemo();
  11.  supobj.show(); 
  12.  
  13.  SubDemo subobj=new SubDemo();
  14.  subobj.show();
  15.  
  16.  }
  17. }





3. 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 show() 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 show() method called");
  6.  
  7. }
  8.  public static void main(String args[]){
  9.  
  10. SuperDemo supobj= new SubDemo();
  11. supobj.show(); 
  12.  
  13. }
  14. }





4. 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 show() method called");
  7.  
  8. }
  9.  
  10.  public void superMethod(){
  11.  
  12.         System.out.println("Super class superMethod() called");
  13.  
  14. }
  15.  
  16. }

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

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

  11.  public static void main(String args[]){
  12.  
  13. SuperDemo supobj= new SubDemo();
  14. supobj.superMethod();
  15.  
  16. // supobj.subMethod();  // compile time error: The method subMethod() is undefined for the
  17. type Super

  18.  ((SubDemo)supobj).subMethod();
  19. ((SuperDemo)supobj).show();
  20. }
  21. }







Instance Of Java

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