I have a field call details which holds different sequence of letter and numbers, what i am trying to do is a Constructor that have a unique sequence of letter and numbers of length 8.
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1please add more details, there is no clarity in your question. – sunleo Nov 12 '12 at 11:39
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Currently, your question is very vague, and is unanswerable. Please provide an [SSCCE](http://sscce.org/) showing what is your problem, and the context where you are using it. – Rohit Jain Nov 12 '12 at 11:40
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What have you tried? Post some pieces of code maybe to clarify what the problem. – Hermann Hans Nov 12 '12 at 11:40
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details have unique sequence of letter and numbers of length 8. – Mohamed Ghassar Nov 12 '12 at 11:41
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@MohamedGhassar do you mean your constructor should accept an argument called details ?? – PermGenError Nov 12 '12 at 11:44