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How to make array elements final

Bharat Makwana
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Joined: May 21, 2007
Posts: 107
Hi Ranchers,

Is there any way to make individual elements of Array final ??

Suppose for primitive int array I want that nobody can change the value of that array's element,once they are assign value ???


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David O'Meara
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Joined: Mar 06, 2001
Posts: 13459

Nope, sorry. You can use Collections.unmodifiableXYZ to create the associated List/Set/Collection
Remko Strating
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Joined: Dec 28, 2006
Posts: 893
You could create a class in which you have a member array which you only can set by creating an instance of that class.

The class only provides a way of getting values from your array



I hope this helps.


Remko (My website)
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David O'Meara
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Joined: Mar 06, 2001
Posts: 13459

Although to be built correctly the class would need to be immutable, which the above code is not eg



To make it immutable you would need to make a defensive copy of the array when it is passed in, and make the class final. (preferably the array field would be final too.

Also, as a matter of style you should throw an existing exception when one is available, so you would throw an ArrayIndexOutOfBounds rather than a IllegalArgumentException
 
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subject: How to make array elements final