description

# open abstract method

Future<RandomAccessFile> open({

1. FileMode mode = FileMode.read,

})

Opens the file for random access operations.

Returns a `Future<RandomAccessFile>` that completes with the opened random access file. RandomAccessFiles must be closed using the RandomAccessFile.close method.

Files can be opened in three modes:

- FileMode.read: open the file for reading.

- FileMode.write: open the file for both reading and writing and truncate the file to length zero. If the file does not exist the file is created.

- FileMode.append: same as FileMode.write except that the file is not truncated.

Throws a FileSystemException if the operation fails.

## Implementation

    Future<RandomAccessFile> open({FileMode mode = FileMode.read});