StandardOpenOption

java.lang.Object
- java.lang.Enum<StandardOpenOption>
- - java.nio.file.StandardOpenOption

所有已实现的接口:

Serializable, Comparable<StandardOpenOption>, OpenOption
```
public enum StandardOpenOption
extends Enum<StandardOpenOption>
implements OpenOption
```
Defines the standard open options.

从以下版本开始:

1.7

枚举常量概要

枚举常量
枚举常量	说明
`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.

方法概要

所有方法静态方法具体方法
限定符和类型	方法	说明
`static StandardOpenOption`	`valueOf(String name)`	返回带有指定名称的该类型的枚举常量。字符串必须与用于声明该类型的枚举常量的标识符完全匹配。(不允许有多余的空格字符。)
`static StandardOpenOption[]`	`values()`	按照声明该枚举类型的常量的顺序, 返回包含这些常量的数组。该方法可用于迭代常量, 如下所示: for (StandardOpenOption c : StandardOpenOption.values()) System.out.println(c);

从类继承的方法 java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- 枚举常量详细资料
  - 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.
    
    另请参阅:
    
    Synchronized I/O file integrity
  - DSYNC
```
public static final StandardOpenOption DSYNC
```
    Requires that every update to the file's content be written synchronously to the underlying storage device.
    
    另请参阅:
    
    Synchronized I/O file integrity
- 方法详细资料
  - values
```
public static StandardOpenOption[] values()
```
    按照声明该枚举类型的常量的顺序, 返回包含这些常量的数组。该方法可用于迭代常量, 如下所示:
```
for (StandardOpenOption c : StandardOpenOption.values())
    System.out.println(c);
```
    返回:
    
    按照声明该枚举类型的常量的顺序返回的包含这些常量的数组
  - valueOf
```
public static StandardOpenOption valueOf(String name)
```
    返回带有指定名称的该类型的枚举常量。字符串必须与用于声明该类型的枚举常量的标识符完全匹配。(不允许有多余的空格字符。)
    
    参数:
    
    name - 要返回的枚举常量的名称。
    
    返回:
    
    返回带有指定名称的枚举常量
    
    抛出:
    
    IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量
    
    NullPointerException - 如果参数为空值

枚举 StandardOpenOption

枚举常量概要

方法概要

从类继承的方法 java.lang.Enum

从类继承的方法 java.lang.Object

枚举常量详细资料

READ

WRITE

APPEND

TRUNCATE_EXISTING

CREATE

CREATE_NEW

DELETE_ON_CLOSE

SPARSE

SYNC

DSYNC

方法详细资料

values

valueOf