Java Module java.prefs Package java.util.prefs Interface PreferencesFactory（JDK11）

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```
public interface PreferencesFactory
```
A factory object that generates Preferences objects. Providers of new Preferences implementations should provide corresponding PreferencesFactory implementations so that the new Preferences implementation can be installed in place of the platform-specific default implementation.
This class is for Preferences implementers only. Normal users of the Preferences facility should have no need to consult this documentation.

Since:

1.4

See Also:

Preferences

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Preferences`	`systemRoot()`	Returns the system root preference node.
`Preferences`	`userRoot()`	Returns the user root preference node corresponding to the calling user.

- Method Detail
  - systemRoot
```
Preferences systemRoot()
```
    Returns the system root preference node. (Multiple calls on this method will return the same object reference.)
    
    Returns:
    
    the system root preference node
  - userRoot
```
Preferences userRoot()
```
    Returns the user root preference node corresponding to the calling user. In a server, the returned value will typically depend on some implicit client-context.
    
    Returns:
    
    the user root preference node corresponding to the calling user

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