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Core java online programming test on inheritance

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Core java online programming test on inheritance Posted: Jul 17, 2016 1:03 AM
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This post originated from an RSS feed registered with Java Buzz by instanceof java.
Original Post: Core java online programming test on inheritance
Feed Title: Instance Of Java
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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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Advertisement
  • Inheritance means getting properties from one class object to another.
  • So in sub class we can use or access super class variables and method : re usability
  • There are some interesting and important points to discuss about inheritance
  • In major java interviews and java online test on core java there is more chance of getting programming questions from inheritance
  • So let us see some java test questions. java test online to practice
  • If you want explanations then visit below topic
  • Top 16 Java Inheritance Interview questions for freshers and experienced  




5 Points to know about inheritance:

Program #1: Java test on inheritance:
  • Creating object for super class and calling super class methods and accessing super class variables.

  1. package interviewprograms.instanceofjava;
  2. public class Super{
  3.  
  4.  int a, int b;
  5.  
  6. void show(){
  7.  System.out,println("Inside Show method");
  8. }
  9.  
  10. }



  1. package interviewprograms.instanceofjava;
  2. public class Sub extends Super{
  3.  int a, int b;
  4. public static void main(String[] args) {
  5.         
  6. Super obj= new Super();
  7. obj.a=10;
  8. System.out,println(obj.a);
  9.  obj.show();
  10. }
  11. }


Click for Output



Program #2: Core Java online test on inheritance:
  • Creating object for sub class and calling sub class methods and accessing sub class variables.

  1. package interviewprograms.instanceofjava;
  2. public class Super{
  3.  
  4.  int a, int b;
  5.  
  6. void show(){
  7.  System.out,println("Inside Show method");
  8. }
  9.  
  10. }

  1. package interviewprograms.instanceofjava;
  2.  
  3. public class Sub extends Super{
  4.  int x;
  5.  
  6.  
  7. void show(){
  8.  System.out,println("Inside Sub class Show method");
  9. }
  10. public static void main(String[] args) {
  11.         
  12. Sub obj= new Sub ();
  13. obj.x=10;
  14. System.out,println(obj.x);
  15.  obj.show();
  16. }
  17. }


Click for Output


Program #3: core java online test for beginners and experienced on inheritance
  • Creating object for sub class accessing super class members and sub class members.

  1. package interviewprograms.instanceofjava;
  2. public class Super{
  3.  
  4.  int a, int b;
  5.  
  6. void show(){
  7.  System.out,println("Inside Show method");
  8. }
  9.  
  10. void print(){
  11.  System.out,println("Inside super class print method");
  12. }
  13.  
  14. }

  1. package interviewprograms.instanceofjava;
  2.  
  3. public class Sub extends Super{
  4.  int x;
  5.  
  6.  
  7. void show(){
  8.  System.out,println("Inside Sub class Show method");
  9. }
  10. void msg(){
  11.  System.out,println("Inside Sub class msg method");
  12. }
  13. public static void main(String[] args) {
  14.         
  15. Sub obj= new Sub ();
  16. obj.x=10;
  17. System.out,println(obj.x);
  18.  obj.show();
  19. obj.print();
  20. }
  21. }


Click for Output




Program #4: core java online test for beginners and experienced on inheritance
  • Creating object for sub class and assigning to super class reference.

  1. package interviewprograms.instanceofjava;
  2. public class Super{
  3.  
  4.  int a, int b;
  5.  
  6. void show(){
  7.  System.out,println("Inside Show method");
  8. }
  9.  
  10. void print(){
  11.  System.out,println("Inside super class print method");
  12. }
  13.  
  14. }


core java online test for beginners



Click for Output


Program #5: core java online test for beginners and experienced on inheritance

  • Creating object for sub class and assigning to super class reference and calling sub class method.
  1. package interviewprograms.instanceofjava;
  2. public class Super{
  3.  
  4.  int a, int b;
  5.  
  6. void show(){
  7.  System.out,println("Inside Show method");
  8. }
  9.  
  10. void print(){
  11.  System.out,println("Inside super class print method");
  12. }
  13.  
  14. }


  1. package interviewprograms.instanceofjava;
  2.  
  3. public class Sub extends Super{
  4.  int x;
  5.  
  6.  
  7. void show(){
  8.  System.out,println("Inside Sub class Show method");
  9. }
  10.  
  11. void msg(){
  12.  System.out,println("Inside Sub class msg method");
  13. } 
  14.  
  15. public static void main(String[] args) {
  16.         
  17. Super obj= new Sub (); 
  18. obj.msg();
  19. }
  20. }


Click for Output


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