How to create more kinds of singleton objects?

Question

Hello,
in my application I need to create more objects. Every object does during its creation same actions (they differ only in one parameter) and add some own methods.
These all objects should behave as a singleton pattern.
Could you help me (different design pattern) how to achieve this?
Thank you.

Answer 1

I have such slightly modified Multiton pattern class.
Now I want create a method that returns database server IP address from database setting type - try to tell me (exactly) how to write this method.
public class Setting {
     public enum Type {
          database, application, mail
     private static final Map<Object, Setting> instances = new HashMap<Object, Setting>();
     protected PropertiesFile file = null;
     private Setting(Setting.Type key) throws IOException {
          file = new PropertiesFile(key.toString() + ".properties");
     public static Setting getDatabase() throws IOException {
          return Setting.getInstance(Setting.Type.database);
     public static Setting getApplication() throws IOException {
          return Setting.getInstance(Setting.Type.application);
     public static Setting getMail() throws IOException {
          return Setting.getInstance(Setting.Type.mail);
     private static Setting getInstance(Setting.Type key) throws IOException {
          Setting instance = instances.get(key);
          if (instance == null) {
               instance = new Setting(key);
               instances.put(key, instance);
          return instance;
}