Determining If a Preference Node Exists : Preference « Development « Java Tutorial

1. Java Tutorial
2. Development
3. Preference

import java.util.prefs.Preferences;

public class Main {
  public static void main(String[] argv) throws Exception {
    boolean exists = Preferences.userRoot().nodeExists("/yourValue"); // false

    Preferences.userRoot().node("/yourValue");

    exists = Preferences.userRoot().nodeExists("/yourValue"); // true

    Preferences prefs = Preferences.userRoot().node("/yourValue");
    prefs.removeNode();

    // exists = prefs.nodeExists("/yourValue");

    exists = prefs.nodeExists(""); // false
  }
}