java.nio.file

Enum StandardOpenOption

Table des matières

    • Enum Constant Summary

      Enum Constants 
      Enum Constant and Description
      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's 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.

        

    • Enum Constant Detail

      • APPEND

        public static final StandardOpenOption APPEND
        If the file is opened for WRITE access then bytes will be written to the end of the file rather than the beginning.

        If the file is opened for write access by other programs, then it is file system specific if writing to the end of the file is atomic.

      • TRUNCATE_EXISTING

        public static final StandardOpenOption TRUNCATE_EXISTING
        If the file already exists and it is opened for WRITE access, then its length is truncated to 0. This option is ignored if the file is opened only for READ access.

      • CREATE

        public static final StandardOpenOption CREATE
        Create a new file if it does not exist. This option is ignored if the CREATE_NEW option is also set. The check for the existence of the file and the creation of the file if it does not exist is atomic with respect to other file system operations.

      • CREATE_NEW

        public static final StandardOpenOption CREATE_NEW
        Create a new file, failing if the file already exists. The check for the existence of the file and the creation of the file if it does not exist is atomic with respect to other file system operations.

      • DELETE_ON_CLOSE

        public static final StandardOpenOption DELETE_ON_CLOSE
        Delete on close. When this option is present then the implementation makes a best effort attempt to delete the file when closed by the appropriate close method. If the close method is not invoked then a best effort attempt is made to delete the file when the Java virtual machine terminates (either normally, as defined by the Java Language Specification, or where possible, abnormally). This option is primarily intended for use with work files that are used solely by a single instance of the Java virtual machine. This option is not recommended for use when opening files that are open concurrently by other entities. Many of the details as to when and how the file is deleted are implementation specific and therefore not specified. In particular, an implementation may be unable to guarantee that it deletes the expected file when replaced by an attacker while the file is open. Consequently, security sensitive applications should take care when using this option.

        For security reasons, this option may imply the LinkOption.NOFOLLOW_LINKS option. In other words, if the option is present when opening an existing file that is a symbolic link then it may fail (by throwing IOException).

      • SPARSE

        public static final StandardOpenOption SPARSE
        Sparse file. When used with the CREATE_NEW option then this option provides a hint that the new file will be sparse. The option is ignored when the file system does not support the creation of sparse files.

    • Method Detail

      • values

        public static StandardOpenOption[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows: 
        for (StandardOpenOption c : StandardOpenOption.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static StandardOpenOption valueOf(String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        IllegalArgumentException - if this enum type has no constant with the specified name
        NullPointerException - if the argument is null

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Document créé le 11/06/2005, dernière modification le 04/03/2020
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