Java Language Preferences Getting sub-nodes of Preferences
Example
Preferences objects always represent a specific node in a whole Preferences tree, kind of like this:
/userRoot
├── com
│ └── mycompany
│ └── myapp
│ ├── darkApplicationMode=true
│ ├── showExitConfirmation=false
│ └── windowMaximized=true
└── org
└── myorganization
└── anotherapp
├── defaultFont=Helvetica
├── defaultSavePath=/home/matt/Documents
└── exporting
├── defaultFormat=pdf
└── openInBrowserAfterExport=falseTo select the /com/mycompany/myapp node:
-
By convention, based on the package of a class:
package com.mycompany.myapp; // ... // Because this class is in the com.mycompany.myapp package, the node // /com/mycompany/myapp will be returned. Preferences myApp = Preferences.userNodeForPackage(getClass()); -
By relative path:
Preferences myApp = Preferences.userRoot().node("com/mycompany/myapp");Using a relative path (a path not starting with a
/) will cause the path to be resolved relative to the parent node it is resolved on. For example, the following example will return the node of the path/one/two/three/com/mycompany/myapp:Preferences prefix = Preferences.userRoot().node("one/two/three"); Preferences myAppWithPrefix = prefix.node("com/mycompany/myapp"); // prefix is /one/two/three // myAppWithPrefix is /one/two/three/com/mycompany/myapp -
By absolute path:
Preferences myApp = Preferences.userRoot().node("/com/mycompany/myapp");Using an absolute path on the root node will not be different from using a relative path. The difference is that, if called on a sub-node, the path will be resolved relative to the root node.
Preferences prefix = Preferences.userRoot().node("one/two/three"); Preferences myAppWitoutPrefix = prefix.node("/com/mycompany/myapp"); // prefix is /one/two/three // myAppWitoutPrefix is /com/mycompany/myapp
