23. StandardOpenOption constants

• Enum java.nio.file.StandardOpenOption provides modes for file opening:

  • APPEND -- if the file is opened for WRITE access then bytes will be written to the end of the file rather than the beginning.

  • CREATE -- create a new file if it does not exist.

  • CREATE_NEW -- create a new file, failing if the file already exists.

  • DELETE_ON_CLOSE -- delete on close.

  • DSYNC -- requires that every update to the file's content be written synchronously to the underlying storage device.

  • READ -- open for read access.

  • SPARSE -- sparse file.

  • SYNC -- requires that every update to the file content or metadata be written synchronously to the underlying storage device.

  • TRUNCATE_EXISTING -- if the file already exists and it is opened for WRITE access, then its length is truncated to 0.

  • WRITE -- open for write access.