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   Object Parameterized Constructor:

          A Constructor is said to be object parameterized if and only if it takes object as 

    parameter. 

   By using this concept is to copy the content of one object into another object.

   The Concept of object parameterized constructor exactly similar to the concept of 

   copy constructor of C++.   In other words copy constructor concept doesnot support by java.but we can obtained the  

   functionality of copy constructor by using object parameterized constructor.

    Following Program illustrates the concept of default overloaded and object  

    parameterized constructor.

      For Example:

       Class Consdemo2

     { 

         int a,b;

         Consdemo2()// Default Constructor

       {

          System.out.println(“default parameterized Constructor”);

          a=1;

          b=2;

          System.out.println(“value of a”+a);

          System.out.println(“value of b”+b);

       }

       

     Consdemo2(int x,int y)// Double Parameterized Constructor

     {

        System.out.println(“double parameterized Constructor”);

        a=x;

        b=y;      

         System.out.println(“value of a”+a);

         System.out.println(“value of b”+b);

      }

      

      Consdemo2(Consdemo2 X)//Formal Parameter X Of Consdemo2 Class

     {

        System.out.println(“Object parameterized Constructor”);

        a=X.a;

        b=X.b;

        System.out.println(“value of a”+a);

        System.out.println(“value of b”+b);

     }

   Class MainDemo

 {

     Public static void main(String args[])

    {

     Consdemo2 c1=new Consdemo2(); 

     Consdemo2 c2=new Consdemo2(10,20);

     Consdemo2 c3=new Consdemo2(c2);//Object Parameterized  Calling constructor  Or We can call it as              

     //new Consdemo2(c2)

    }

 }

   Analaysis:

     In the above program Object c3 storing value that are stored in the Object c2 of values are  

   10,20.

    Consdemo2(Consdemo2  X) formal parameter of X of type ConsDemo2, then X it access  

   as X.a and X.b.

   OutPut:

   

   Default parameterized constructor

   1

   2

  Double parameterized constructor

  10

  20

  Object parameterized constructor

  10

  20