File I/O - Java - page 579

Display 10.21 Some Methods of the Class RandomAccessFile (part 1 of 3)
The class RandomAccessFile is in the java.io package.
public RandomAccessFile(String fileName, String mode)
public RandomAccessFile(File fileObject, String mode)
Opens the file, does not delete data already in the file, but does position the file pointer at the first
(zeroth) location.
The mode must be one of the following:
"r" Open for reading only.
"rw" Open for reading and writing.
"rws" Same as "rw" , and also requires that every update to the file's content or metadata be
written synchronously to the underlying storage device.
"rwd" Same as "rw" , and also requires that every update to the file's content be written synchro-
nously to the underlying storage device.
"rws" and "rwd" are not covered in this topic.
public long getFilePointer() throws IOException
Returns the current location of the file pointer. Locations are numbered starting with 0 .
public void seek( long location) throws IOException
Moves the file pointer to the specified location .
public long length() throws IOException
Returns the length of the file.
public void setLength( long newLength) throws IOException
Sets the length of this file.
If the present length of the file as returned by the length method is greater than the newLength
argument, then the file will be truncated. In this case, if the file pointer location as returned by the
getFilePointer method is greater than newLength , then after this method returns, the file pointer
location will be equal to newLength .
If the present length of the file as returned by the length method is smaller than newLength , then the
file will be extended. In this case, the contents of the extended portion of the file are not defined.
public void close() throws IOException
Closes the stream's connection to a file.
public void write(int b) throws IOException
Writes the specified byte to the file.
public void write( byte [] a) throws IOException
Writes a.length bytes from the specified byte array to the file.