HELP on object duplication!

Hi, I'm having some troubles when I try to make some local modifications while keeping the main array intact. My code looks like this
classname [] P = new classname [constant]
classname temp = P[2];
.I noticed that whenever I change temp P[2] is also changed, so I tried this
classname [] P = new classname [constant]
classname [] Pcopy = P.clone();
classname temp = Pcopy[2]
.But even in this case P[2] was modified whenever an operation on temp is applied? How do I get around this nasty problem?
Thanks a lot!!!

abrli wrote:
Hi, I'm having some troubles when I try to make some local modifications while keeping the main array intact. My code looks like this
classname [] P = new classname [constant]
classname temp = P[2];
.I noticed that whenever I change temp P[2] is also changed, so I tried thisYes. Because P[2] and temp both hold references to the same object. A variable's value is never an object in Java, just a reference to an object. When you do x = y you're copying a reference, not an object, so now two references point to the same object.
classname [] P = new classname [constant]
classname [] Pcopy = P.clone();
classname temp = Pcopy[2]
.But even in this case P[2] was modified whenever an operation on temp is applied?Right. Because you've not copied the array, which contains references. You now have two arrays of references pointing to the same objects. P[0] points to the same object as Pcopy[0], etc.
How do I get around this nasty problem?
temp = P[2].clone();
// OR
temp = new WhateverThatClassIs(P[2]);Note that this will copy the object that P[2] points to, but if it has member variables that point to mutable objects, and if you might be changing those objects' states, and if you don't want that change to be reflected in both P[2] and temp, you'll need to clone or copy-construct those as well.
Finally, as a side note, class names should start with uppercase and variables with lowercase. Constants should be all upper
classname [] P = new classname [constant]
// should be
Classname [] p = new Classname [CONSTANT]
Thanks a lot!!!

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