Constructor in java or Android.....

Constructor :-

·         Constructor can be invoked only one time per object creation by using new keyword. Programmer cannot invoke constructor many times because constructor are designed

·         Constructor never inherit  fields invoke by calling object

·         "constructor" should really be called an "initializer."

·         Every class has only one constructor

·         There is not any default constructor because of if we write any thing than this thing can not default  also colled parameter less constructor If we are not initialize any constructor then it make default constructor.

·         A constructor doesn’t have a return type.even void.they can not return any values.

·         Unlike methods, constructors are not considered members of a class

·         A constructor is called automatically when a new instance of an object is created.

·         constructors can have any of the access modifiers: public, protected, private, or none (often called package or friendly).

·         If we want to implecit call to the operators new and delete.

1:- perameterized constructor:-

Class integer

{

Int m ,n;

Public integer(int x,int y)

}

Integer integers=new integer(4,5);

System.out.println(“”+integers);

2:- copy constructor:-

Is get values same as valu and assign to in a member variable and this value we can use in to different  operations….etc……

Ex:-

Class A{

Int a,b,c;

Public A(int x,int y,int z)

{

…………………

………………….

}

A  d(3,4,5);

A U(A); // constructor copy

3:- Dynamic constructor:-

It initialize memory at run time