Get keys from Preferences : Preference « Development « Java Tutorial

1. Java Tutorial
2. Development
3. Preference

import java.io.FileOutputStream;
import java.util.prefs.Preferences;

public class PreferenceExample {
  public static void main(String args[]) throws Exception {
    Preferences prefsRoot = Preferences.userRoot();
    Preferences myPrefs = prefsRoot.node("PreferenceExample");

    myPrefs.put("A", "a");
    myPrefs.put("B", "b");
    myPrefs.put("C", "c");

    System.out.print("Node's keys: ");
    for (String s : myPrefs.keys()) {
      System.out.print(s + "");
    }
  }
}