│ └── myapp
│ ├── darkApplicationMode=true
│ ├── showExitConfirmation=false
│ └── windowMaximized=true
└── org
└── myorganization
└── anotherapp
├── defaultFont=Helvetica
├── defaultSavePath=/home/matt/Documents
└── exporting
├── defaultFormat=pdf
└── openInBrowserAfterExport=false
要选择
/com/mycompany/myapp
节点：
按照惯例，基于类的包：
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());
按相对路径：
Preferences myApp = Preferences.userRoot().node("com/mycompany/myapp");
使用相对路径（不以/开头的路径）将导致路径相对于其解析的父节点被解析。例如，以下示例将返回路径/one/two/three/com/mycompany/myapp 的节点：
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
按绝对路径：
Preferences myApp = Preferences.userRoot().node("/com/mycompany/myapp");
在根节点上使用绝对路径与使用相对路径没有区别。不同之处在于，如果在子节点上调用，则将相对于根节点解析路径。
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
