ProcessBuilder.Redirect (Java Platform SE 8 )

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

Enclosing class:

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(File)
- a redirection to write to a file, created by an invocation of Redirect.to(File)
- a redirection to append to a file, created by an invocation of Redirect.appendTo(File)
Each of the above categories has an associated unique Type.
Since:

1.7

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

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

Nested Classes
Modifier and Type	Class and Description
`static class`	`ProcessBuilder.Redirect.Type` The type of a `ProcessBuilder.Redirect`.

Field Summary

Fields
Modifier and Type	Field and Description
`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.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`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`.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - 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
 
```
  - 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
 
```
- Method Detail
  - type
```
public abstract ProcessBuilder.Redirect.Type type()
```
    Returns the type of this Redirect.
    
    Returns:
    
    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.
    
    Returns:
    
    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
 
```
    Parameters:
    
    file - The File for the Redirect.
    
    Returns:
    
    a redirect to read from the specified file
    
    Throws:
    
    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
 
```
    Parameters:
    
    file - The File for the Redirect.
    
    Returns:
    
    a redirect to write to the specified file
    
    Throws:
    
    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
 
```
    Parameters:
    
    file - The File for the Redirect.
    
    Returns:
    
    a redirect to append to the specified file
    
    Throws:
    
    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.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    obj - the reference object with which to compare.
    
    Returns:
    
    true if this object is the same as the obj argument; false otherwise.
    
    See Also:
    
    Object.hashCode(), HashMap
  - hashCode
```
public int hashCode()
```
    Returns a hash code value for this Redirect.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    a hash code value for this Redirect
    
    See Also:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2019, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

Class ProcessBuilder.Redirect

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

PIPE

INHERIT

Method Detail

type

file

from

to

appendTo

equals

hashCode