Constructor Chaining In Java | How To Achieve Constructor Chaining In Java

                               Constructor chaining

Constructor chaining is phenomenon in which sub class constructor makes a call to its super class constructor and superclass constructor makes a call to its superclass constructor. It can be done implicit or explicit.

**Note: 1.  if constructor chaining will not happen then the inheritance will not happen at the level of class.

Constructor never be inherited but it play major role/rules to achieve inheritance.

Example:

Constructor Chaining Example:

class A{

A(){

System.out.println(" 1st construtor A() is exicuted");

}

void m1(){

System.out.println("m1() of A is exicuted");

}

}

class B extends A{

B(){

System.out.println("2nd construtor B() is exicuted ");

}

void m2(){

System.out.println(" finally method m2() of B is exicuted ");

}

}

class TestABCD{

public static void main(String[] args) {

B ref2 = new B();

ref2.m2();

}

}

Output

1st construtor A() is exicuted

2nd construtor B() is exicuted

finally method m2() of B is exicuted