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  Java - Cloneable  (Read 818 times)
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Offline Phibedy

Senior Devvie


Medals: 9



« Posted 2012-12-20 16:29:08 »

Hi, I've got some problems with the cloneable interface  Roll Eyes
Stucture:
ArrayList with custom graphic-objects;
graphic-object -> ArrayList with vectors + array with vectors + one lonely vector

Now I would like to clone this arrayList. Until now, I wrote my own clone() method (I just call the construc. of the object with the param. of the object to create a new object and return it).
ButI would like to use arraylist.clone(), therefore I have to implement the cloneable interface. Is it faster then creating a new object? Googled said, that it could fail.
How would you copy the arrayList?
Best regards
Offline sproingie

JGO Kernel


Medals: 202



« Reply #1 - Posted 2012-12-20 17:14:24 »

For a shallow copy:
new ArrayList<Foo>(oldArrayList)
.  This works for any collection.

Chances are you don't really want a deep copy.  If you do, then there's really no shortcut, you'll have to do it by hand.

Offline Phibedy

Senior Devvie


Medals: 9



« Reply #2 - Posted 2012-12-20 21:17:45 »

thx  Grin
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Offline Nate

« JGO Bitwise Duke »


Medals: 165
Projects: 4
Exp: 14 years


Esoteric Software


« Reply #3 - Posted 2012-12-21 05:50:59 »

Chances are you don't really want a deep copy.  If you do, then there's really no shortcut, you'll have to do it by hand.
Mostly true, though Kryo can do deep copies (proper object->object too, not object->bytes->objects). Smiley But often, especially with complex objects, you'll just want to write copy constructors and do it by hand.

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