explict consructor calling

[sanjay123456]

Dear Friends ,

in java the creation of object of class hello is following

hello h = new hello();
here hello() means call explictely constructor calling mechnism

but in c++

we write only helllo h;

and object is created and implictely constructor is callling

my question is this why java is call explictely constructor mechnism is accepted
why we do not write only hello h; and after that implictely constructor is called

what is meaning of explictely constructor mechnism in java ?
why is required ?


sanjay

[r035198x]

Dear Friends ,



in java the creation of object of class hello is following



hello h = new hello();

here hello() means call explictely constructor calling mechnism



but in c++



we write only helllo h;



and object is created and implictely constructor is callling



my question is this why java is call explictely constructor mechnism is accepted

why we do not write only hello h; and after that implictely constructor is called



what is meaning of explictely constructor mechnism in java ?

why is required ?





sanjay

Because in Java you create objects only through the new keyword.

[dmjpro]

i think u r from c++ background
if u write hello h() means in c++ ............is a function declaration..
h is a function which returns object type hello.
in java there is no direct access of object only access to object reference that is implicit pointer
in java hello h means a object reference with null value until and unless u use new the jvm does not give it the memory
need any more help plz send me reply..
i am online...

[bala1980]

Dear Friends ,

in java the creation of object of class hello is following

hello h = new hello();
here hello() means call explictely constructor calling mechnism

but in c++

we write only helllo h;

and object is created and implictely constructor is callling

my question is this why java is call explictely constructor mechnism is accepted
why we do not write only hello h; and after that implictely constructor is called

what is meaning of explictely constructor mechnism in java ?
why is required ?


sanjay

Hi,

In java if we gave as Hello h means it just create a reference and not an object. Only after using new only the object fo the class is created.

Hello h; - > Reference
Hello h = new Hello() - > Object

[dmjpro]

okay...
in second case the h holds the address of the object