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//Identify a file by its path
String filename = // initialized
RandomAccessFile file = new RandomAccessFile( filename, "rw");


// Write to file...


// Go back to beginning and read contents
file.seek(0);
try {
  while (true) {
    String s = file.readUTF();
    System.out.print(s);
  }
} catch (EOFException x) {
  // ignoreIgnore, this breaks out of while loop
}

br.close();