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For the sake of interest. (Wrapper vs. primitive)

5 replies on 1 page. Most recent reply: Aug 1, 2005 2:27 AM by Matthias Neumair

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Kondwani Mkandawire

Posts: 530
Nickname: spike
Registered: Aug, 2004

For the sake of interest. (Wrapper vs. primitive) Posted: Jul 27, 2005 7:03 AM
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Why is it that in Eclipse (haven't tried this
manually yet) if I have an Object that
takes in Boolean the wrapper *Object* for the
primitive boolean as a parameter, it doesn't
complain when I pass in its primitive.

E.g:


class A{
    public A(Boolean t){
       //  do something
    }
}

Making the call.



Why does this the following call not result in
a compile time error?

// Passes compilation
A my_obj = new A(false);


Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: For the sake of interest. (Wrapper vs. primitive) Posted: Jul 27, 2005 8:10 AM
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Because you're using J2 v1.5

http://java.sun.com/j2se/1.5.0/docs/relnotes/features.html#boxing

Kondwani Mkandawire

Posts: 530
Nickname: spike
Registered: Aug, 2004

Re: For the sake of interest. (Wrapper vs. primitive) Posted: Jul 27, 2005 8:17 AM
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Makes sense.

Tx

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: For the sake of interest. (Wrapper vs. primitive) Posted: Jul 27, 2005 10:59 PM
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I prefer the old style wich makes me plan/think a bit more.

Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: For the sake of interest. (Wrapper vs. primitive) Posted: Jul 29, 2005 11:08 PM
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Hmm... Does the old way help you think at a higher level about your design, or just more about little details?

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: For the sake of interest. (Wrapper vs. primitive) Posted: Aug 1, 2005 2:27 AM
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Little details.

I distinguish between design and implementation.

In my opinion the implementation should not be too easy. Knowing every detail of big parts of the code helps me if I have to do some changes.

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