Core java online programming test on inheritance

Posted by: Instanceofjava Posted date: July 17, 2016 / comment : 0 java programming interview questions , Java Programs , java test

• 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

1. 10
2. Inside Show method

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

1. 10
2. Inside Sub class Show method

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

1. 10
2. Inside Sub class Show method
3. Inside super class print method

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. }

Click for Output

1. Inside Sub class Show method

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

1. Compile time error : The method msg() is undefined for the type Super

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