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Constructor chaining in java using this and super Keywords

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Constructor chaining in java using this and super Keywords Posted: Feb 15, 2016 9:39 AM
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Constructor chaining example program in same class using this keyword.


  1. package instanceofjava;
  2. class ConstructorChaining{
  3. int a,b 
  4. ConstructorChaining(){
  5. this(1,2);
  6.  System.out.println("Default constructor");
  7.  
  8. } 
  9.  
  10. ConstructorChaining(int x , int y){
  11.  
  12. this(1,2,3); 
  13. a=x;
  14. b=y;
  15.  System.out.println("Two argument constructor");
  16.  
  17. }
  18.  
  19. ConstructorChaining(int a , int b,int c){
  20.  System.out.println("Three argument constructor")
  21. } 
  22.  
  23. public static void main(String[] args){
  24.  
  25.  ConstructorChaining obj=new ConstructorChaining();
  26.   System.out.println(obj.a);
  27.   System.out.println(obj.b);
  28.  
  29. }
  30. }


Output:

  1. Three argument constructor
  2. Two argument constructor
  3. Default argument constructor
  4. 1
  5. 2

Constructor chaining example program in same class using this and super keywords.

  1. package instanceofjava;
  2. class SuperClass{
  3.  
  4. SuperClass(){
  5. this(1);
  6.  System.out.println("Super Class no-argument constructor");
  7.  
  8. } 
  9.  
  10. SuperClass(int x ){
  11.  
  12. this(1,"constructor chaining"); 
  13. System.out.println("Super class one -argument constructor(int)");
  14.  
  15. }
  16.  
  17. SuperClass(int x , String str){
  18.  System.out.println("Super class two-argument constructor(int, String)");
  19. } 
  20.  
  21. }


  1. package instanceofjava;
  2. class SubClass extends SuperClass{

  4. SubClass(){
  5. this(1);
  6.  System.out.println("Sub Class no-argument constructor");
  7.  
  8. } 
  9.  
  10. SubClass(int x ){
  11.  
  12. this("Constructor chaining"); 
  13.  System.out.println("Sub class integer argument constructor");
  14.  
  15. }
  16.  
  17. ConstructorChaining(String str){
  18. //here by default super() call will be there so it will call super class constructor
  19.   System.out.println("Sub class String argument constructor");
  20. } 
  21.  
  22. public static void main(String[] args){
  23.  
  24.  SubClass obj=new SubClass();
  25.  
  26.  
  27. }
  28. }

Output:

  1. Super class two-argument constructor(int, String)
  2. Super class one -argument constructor(int)
  3. Super Class no-argument constructor
  4. Sub class String argument constructor
  5. Sub class String argument constructor
  6. Sub class integer argument constructor




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