February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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15.4.4 Updating Sequential-Access Files
The data in many sequential files cannot be modified without the risk of destroying other data in the file. For example, if the name “White” needs to be changed to “Worthington,” the old name cannot simply be overwritten, because the new name requires more space. The record for White was written to the file as
300 Pam White 0.00
If the record is rewritten beginning at the same location in the file using the new name, the record will be
300 Pam Worthington 0.00
The new record is larger (has more characters) than the original record. “Worthington” would overwrite the “0.00” in the current record and the characters beyond the second “o” in “Worthington” will overwrite the beginning of the next sequential ...
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