Getting the Maximum Size of a Preference Key and Value : Preference « Development « Java Tutorial

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2. Development
3. Preference

import java.util.prefs.Preferences;

public class Main {
  public static void main(String[] argv) throws Exception {

    // Get maximum key length
    int keyMax = Preferences.MAX_KEY_LENGTH;

    // Get maximum value length
    int valueMax = Preferences.MAX_VALUE_LENGTH;

    // Get maximum length of byte array values
    int bytesMax = Preferences.MAX_VALUE_LENGTH * 3 / 4;
  }
}