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Groups > comp.lang.java.programmer > #30699
| From | Eric Sosman <esosman@comcast-dot-net.invalid> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Recommended way to make shallow copy of array |
| Date | 2015-01-13 18:00 -0500 |
| Organization | A noiseless patient Spider |
| Message-ID | <m94813$2nd$1@dont-email.me> (permalink) |
| References | <m93su6$n1u$1@Gaia.teknon.de> <m944pq$58h$1@news.albasani.net> |
On 1/13/2015 5:04 PM, Sebastian wrote:
> Am 13.01.2015 20:50, schrieb Volker Borchert:
>> Given an array of runtime component type T, I want to create a new
>> array of the same runtime component type referencing the same objects.
>> The two ways I know to achieve this are Arrays.copyOf() and T[].clone().
>> Target VM is Hotspot Client of Sun JDK 1.7.0_72, will move on to Sun
>> JDK 1.8.0_<then-current> some time not so far in the future. Which
>> method should I prefer? Any other suggestions? Primary use case are
>> defensive copies, where T is some immutable type or a primitive.
>>
>> TIA
>>
>>
>
> There are several ways to copy an array :
>[...]
> - call its clone method, and do a cast (the simplest style, suitable for
> a shallow clone)
Why cast?
"The return type of the clone method of an array type T[] is T[]."
http://docs.oracle.com/javase/specs/jls/se8/html/jls-10.html#jls-10.7
--
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM
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Recommended way to make shallow copy of array v_borchert@despammed.com (Volker Borchert) - 2015-01-13 19:50 +0000
Re: Recommended way to make shallow copy of array Joerg Meier <joergmmeier@arcor.de> - 2015-01-13 22:40 +0100
Re: Recommended way to make shallow copy of array Joerg Meier <joergmmeier@arcor.de> - 2015-01-13 22:44 +0100
Re: Recommended way to make shallow copy of array Sebastian <news@seyweiler.dyndns.org> - 2015-01-13 23:04 +0100
Re: Recommended way to make shallow copy of array Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-01-13 18:00 -0500
Re: Recommended way to make shallow copy of array v_borchert@despammed.com (Volker Borchert) - 2015-01-19 20:15 +0000
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