ProcessBuilder.Redirect

java.lang.Object
- java.lang.ProcessBuilder.Redirect

封闭类:

ProcessBuilder
```
public abstract static class ProcessBuilder.Redirect
extends Object
```
Represents a source of subprocess input or a destination of subprocess output. Each Redirect instance is one of the following:
- the special value Redirect.PIPE
- the special value Redirect.INHERIT
- a redirection to read from a file, created by an invocation of Redirect#from
- a redirection to write to a file, created by an invocation of Redirect#to
- a redirection to append to a file, created by an invocation of Redirect#appendTo
Each of the above categories has an associated unique Type.
从以下版本开始:

1.7

嵌套类概要

嵌套类
限定符和类型类说明

static class ProcessBuilder.Redirect.Type
The type of a Redirect.

嵌套类
限定符和类型	类	说明
`static class`	`ProcessBuilder.Redirect.Type`	The type of a `Redirect`.

字段概要

字段
限定符和类型	字段	说明
`static ProcessBuilder.Redirect`	`INHERIT`	Indicates that subprocess I/O source or destination will be the same as those of the current process.
`static ProcessBuilder.Redirect`	`PIPE`	Indicates that subprocess I/O will be connected to the current Java process over a pipe.

方法概要

所有方法静态方法实例方法抽象方法具体方法
限定符和类型	方法	说明
`static ProcessBuilder.Redirect`	`appendTo(File file)`	Returns a redirect to append to the specified file.
`boolean`	`equals(Object obj)`	Compares the specified object with this `Redirect` for equality.
`File`	`file()`	Returns the `File` source or destination associated with this redirect, or `null` if there is no such file.
`static ProcessBuilder.Redirect`	`from(File file)`	Returns a redirect to read from the specified file.
`int`	`hashCode()`	Returns a hash code value for this `Redirect`.
`static ProcessBuilder.Redirect`	`to(File file)`	Returns a redirect to write to the specified file.
`abstract ProcessBuilder.Redirect.Type`	`type()`	Returns the type of this `Redirect`.

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

- 字段详细资料
  - INHERIT
```
public static final ProcessBuilder.Redirect INHERIT
```
    Indicates that subprocess I/O source or destination will be the same as those of the current process. This is the normal behavior of most operating system command interpreters (shells).
    It will always be true that
```
 
 Redirect.INHERIT.file() == null &&
 Redirect.INHERIT.type() == Redirect.Type.INHERIT
 
```
  - PIPE
```
public static final ProcessBuilder.Redirect PIPE
```
    Indicates that subprocess I/O will be connected to the current Java process over a pipe. This is the default handling of subprocess standard I/O.
    It will always be true that
```
 
 Redirect.PIPE.file() == null &&
 Redirect.PIPE.type() == Redirect.Type.PIPE
 
```
- 方法详细资料
  - type
```
public abstract ProcessBuilder.Redirect.Type type()
```
    Returns the type of this Redirect.
    
    返回:
    
    the type of this Redirect
  - file
```
public File file()
```
    Returns the File source or destination associated with this redirect, or null if there is no such file.
    
    返回:
    
    the file associated with this redirect, or null if there is no such file
  - from
```
public static ProcessBuilder.Redirect from(File file)
```
    Returns a redirect to read from the specified file.
    It will always be true that
```
 
 Redirect.from(file).file() == file &&
 Redirect.from(file).type() == Redirect.Type.READ
 
```
    参数:
    
    file - The File for the Redirect.
    
    返回:
    
    a redirect to read from the specified file
    
    抛出:
    
    NullPointerException - if the specified file is null
  - to
```
public static ProcessBuilder.Redirect to(File file)
```
    Returns a redirect to write to the specified file. If the specified file exists when the subprocess is started, its previous contents will be discarded.
    It will always be true that
```
 
 Redirect.to(file).file() == file &&
 Redirect.to(file).type() == Redirect.Type.WRITE
 
```
    参数:
    
    file - The File for the Redirect.
    
    返回:
    
    a redirect to write to the specified file
    
    抛出:
    
    NullPointerException - if the specified file is null
  - appendTo
```
public static ProcessBuilder.Redirect appendTo(File file)
```
    Returns a redirect to append to the specified file. Each write operation first advances the position to the end of the file and then writes the requested data. Whether the advancement of the position and the writing of the data are done in a single atomic operation is system-dependent and therefore unspecified.
    It will always be true that
```
 
 Redirect.appendTo(file).file() == file &&
 Redirect.appendTo(file).type() == Redirect.Type.APPEND
 
```
    参数:
    
    file - The File for the Redirect.
    
    返回:
    
    a redirect to append to the specified file
    
    抛出:
    
    NullPointerException - if the specified file is null
  - equals
```
public boolean equals(Object obj)
```
    Compares the specified object with this Redirect for equality. Returns true if and only if the two objects are identical or both objects are Redirect instances of the same type associated with non-null equal File instances.
    
    覆盖:
    
    equals 在类中 Object
    
    参数:
    
    obj - the reference object with which to compare.
    
    返回:
    
    true if this object is the same as the obj argument; false otherwise.
    
    另请参阅:
    
    Object.hashCode(), HashMap
  - hashCode
```
public int hashCode()
```
    Returns a hash code value for this Redirect.
    
    覆盖:
    
    hashCode 在类中 Object
    
    返回:
    
    a hash code value for this Redirect
    
    另请参阅:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

类 ProcessBuilder.Redirect

嵌套类概要

字段概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

INHERIT

PIPE

方法详细资料

type

file

from

to

appendTo

equals

hashCode