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From "Andrew Zhang" <zhanghuang...@gmail.com>
Subject Re: [classlib][lang] Is it possible to new an object without invoking any constructor?
Date Thu, 15 Nov 2007 05:19:00 GMT
On Nov 15, 2007 1:18 PM, Andrew Zhang <zhanghuangzhu@gmail.com> wrote:

>
>
> On Nov 15, 2007 1:07 PM, Nathan Beyer <ndbeyer@apache.org> wrote:
>
> > Do you mean this?
> >
> > class MyObject {
> >  String field;
> >  MyObject(){
> >      super();
> >  }
> > }
> >
> > MyObject mo = new MyObject();
> >
> > With regard to fields being in their default state, that's what
> > happens by default. The only thing that changes this is if you inline
> > field assigment with the declaration or assign the fields in the
> > constructor.
>
>
> Hi Nathan,
>
> I want an object with all null values for all reference fields, and
> default value(0/false) for primitive fields, even there's a constructor:
>
> public class MyObject {
>   int i;
>   String s;
>   B b;
>   MyObject() { i = 100; s = "hello";  b= new B(); }
> }
>
> I want to have a MyObject myObject whose i = 0, s = null and b = null.
> Yes, it's very like the initial state of de-serialized. What I have is the
> class definition (e.g class MyObject above), and I want to "new" an
> instance with all null/0 value of MyObject.class by some way. Is it
> possible? Thanks!
>
> >
> >
> > As for creating a new instance without calling a constructor, that's
> > what happens when an instance of something is de-serialized. No
> > constructor is called; just the readObject() and related methods are
>
>
> But I don't have an FileInputStream instance...
>

Sorry, I mean ObjectInputStream...

>
>
> > invoked.
> >
> > -Nathan
> >
> > On Nov 14, 2007 11:58 PM, Andrew Zhang <zhanghuangzhu@gmail.com> wrote:
> > > Hi,
> > >
> > > Is it possible to new an object without invoking any constructor? I
> > know the
> > > question is a bit weird. What I want is to create an object with all
> > > null/default value for its fields.
> > > Reseting all fields to null by reflection is a possible solution, but
> > is
> > > there any existing special method (no matter it's low level or Harmony
> > > specific) which can achieve this goal?
> > > Thanks!
> > >
> > >
> > > --
> > > Best regards,
> > > Andrew Zhang
> > >
> > > http://zhanghuangzhu.blogspot.com/
> > >
> >
>
>
>
> --
>
> Best regards,
> Andrew Zhang
>
> http://zhanghuangzhu.blogspot.com/
>



-- 
Best regards,
Andrew Zhang

http://zhanghuangzhu.blogspot.com/

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