June 2004
Intermediate to advanced
848 pages
21h 28m
English
Content preview from Just Java™ 2
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File Locking
As we saw in the threads chapter, sometimes you have two things going on at once in a program, and to keep them straight you may need to stop them from doing the same thing together. This situation can occur in file handling. An example would be a data file that several programs want to update at the same time. Let's say the last record in the file contains the total of all the other records in the file. When a program updates the file, it first writes the new data value, then it reads the current total, adjusts it for the new value, and writes it back. If another program should happen to come along at just the wrong time, both programs may read the old total, then they will both update it, but one update of the total will overwrite ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.