public static double rint(double a)
Returns the double value that is closest in value to a and is equal to a mathematical integer. If two double values that are mathematical integers are equally close to the value of the argument, the result is the integer value that is even. Special cases:
If the argument value is already equal to a mathematical integer, then the result is the same as the argument.
If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.
public void seek(long pos)
throws IOException
Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs. The offset may be set beyond the end of the file. Setting the offset beyond the end of the file does not change the file length. The file length will change only by writing after the offset has been set beyond the end of the file.
Parameters:
pos - the offset position, measured in bytes from the beginning of the file, at which to set the file pointer.
Throws:
IOException - if pos is less than 0 or if an I/O error occurs.
http://java.sun.com/j2se/1.3/docs/api/index.html