Groups > comp.lang.java.programmer > #33241

Re: Why it necessary to implement clonealbe interface?

Newsgroups	comp.lang.java.programmer
Date	2015-11-29 23:00 -0800
References	<n31vi5$dkg$1@speranza.aioe.org>
Message-ID	<69276629-2d13-49de-a8de-09dcfa4f7341@googlegroups.com> (permalink)
Subject	Re: Why it necessary to implement clonealbe interface?
From	Lew <lewbloch@gmail.com>

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Xue Feng wrote:
> A class has to implement cloneable interface, otherwise its object can 
> not be cloned. IMO, it is enough that a class clone itself by inheriting 
> the clone method from Object class. It is somewaht reduntant to 
> implement cloneable interface. Actually, there is nothing in cloneable 
> interface. Namely, it is defined as follows:
> 
> interface cloneable {
> }
> 
> I wonder the reason for this design. Any explanation? Thanks.

There is no 'cloneable' interface in the standard Java API.

The reason for the requirements of 'Cloneable' that are similar to your question is to prevent cloning except where it's actually wanted, but have the mechanism in place from the very root of the object hierarchy so it is available for such use.

-- 
Lew

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Thread

Why it necessary to implement clonealbe interface? Xue Feng <xf.lotus@yahoo.com> - 2015-11-24 23:28 +0800
  Re: Why it necessary to implement clonealbe interface? Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-24 11:03 -0500
    Re: Why it necessary to implement clonealbe interface? Arne Vajhøj <arne@vajhoej.dk> - 2015-11-24 19:49 -0500
      Re: Why it necessary to implement clonealbe interface? Eric Douglas <e.d.programmer@gmail.com> - 2015-11-25 11:01 -0800
        Re: Why it necessary to implement clonealbe interface? Arne Vajhøj <arne@vajhoej.dk> - 2015-11-25 16:41 -0500
  Re: Why it necessary to implement clonealbe interface? Lew <lewbloch@gmail.com> - 2015-11-29 23:00 -0800

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