Module java.base
Package java.nio.file

Enum Class StandardOpenOption

java.lang.Object
java.lang.Enum<StandardOpenOption>
java.nio.file.StandardOpenOption
All Implemented Interfaces:
Serializable, Comparable<StandardOpenOption>, Constable, OpenOption
public enum StandardOpenOption extends Enum<StandardOpenOption> implements OpenOption
Defines the standard open options.
Since:
1.7

  • Enum Constant Details

    • READ

      public static final StandardOpenOption READ
      Open for read access.

    • WRITE

      public static final StandardOpenOption WRITE
      Open for write access.

    • 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.

    • SYNC

      public static final StandardOpenOption SYNC
      Requires that every update to the file's content or metadata be written synchronously to the underlying storage device.
      See Also:

    • DSYNC

      public static final StandardOpenOption DSYNC
      Requires that every update to the file's content be written synchronously to the underlying storage device.
      See Also:

  • Method Details

    • values

      public static StandardOpenOption[] values()
      Returns an array containing the constants of this enum class, in the order they are declared.
      Returns:
      an array containing the constants of this enum class, in the order they are declared

    • valueOf

      public static StandardOpenOption valueOf(String name)
      Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (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 class has no constant with the specified name
      NullPointerException - if the argument is null