posted 19 years ago
I met the same problem when i was doing the project, my understanding may be wrong: it may be thrown when you creating a new record, the instructions told you that you can reuse a deleted one if available, in this case, a DuplicateKeyException will be thrown. if there's no deleted record, you have to create a new one at the back of the file, so this exception will not be thrown.
I think you understand what i am talking about...forgive my poor English
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[SCJP 1.2, SCJD, SCWCD]