Determining If a Preference Node Contains a Specific Key : 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 {
  }

  // Returns true if node contains the specified key; false otherwise.
  public static boolean contains(Preferences node, String key) {
    return node.get(key, null) != null;
  }
}