Saving Data with the Preferences API

     
import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;

public class PlanetPrefs {
  public static void main(String args[]) {
    String names[] = { "Mercury", "Venus", "Earth", "Mars", "Jupiter",
        "Saturn", "Uranus", "Neptune", "Pluto" };
    int moons[] = { 0, 0, 1, 2, 16, 18, 21, 8, 1 };

    Preferences prefs = Preferences.userRoot()
        .node("/MasteringJava/Chap17");

    for (int i = 0, n = names.length; i < n; i++) {
      prefs.putInt(names[i], moons[i]);
    }

    try {
      String keys[] = prefs.keys();
      for (int i = 0, n = keys.length; i < n; i++) {
        System.out.println(keys[i] + ": " + prefs.getInt(keys[i], 0));
      }
    } catch (BackingStoreException e) {
      System.err.println("Unable to read backing store: " + e);
    }
  }
}

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Saving Data with the Preferences API : Preference Properties « Development Class « Java

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