posted 13 years ago
RandomAcessFile will read or write content in the middle of a file, but it can only replace content of exactly the same length. If you try to replace "hello" with "goodbye" you'll clobber the next couple bytes of whatever followed. You cannot insert or delete content in the middle of a file ... it's just a limitation of the file system. (Some operating systems understand line-oriented files and support such actions.) You're pretty much stuck with reading the whole file, making changes and writing a new file. Such is life.