UI manager Look and Feel sama dengan sistem operasi

       try {
         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
     } catch (Exception ex) {
         ex.printStackTrace();
     }

Properties Factory buat nyimpen setingan file

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;

public class PropertyFactory {

   public static void save(Properties p, String fileName, String comment) {
       PrintWriter pw = null;
       try {
           pw = new PrintWriter(fileName);
       } catch (FileNotFoundException ex) {
           Logger.getLogger(PropertyFactory.class.getName()).log(Level.SEVERE, null, ex);
       }
       try {
           p.store(pw, comment);
       } catch (IOException ex) {
           Logger.getLogger(PropertyFactory.class.getName()).log(Level.SEVERE, null, ex);
       }
   }

   public static Properties read(String fileName) {
       Properties p = new Properties();
       Reader r = null;
       try {
           r = new FileReader(fileName);
       } catch (FileNotFoundException ex) {
           Logger.getLogger(PropertyFactory.class.getName()).log(Level.SEVERE, null, ex);
       }
       try {
           p.load(r);
       } catch (IOException ex) {
           Logger.getLogger(PropertyFactory.class.getName()).log(Level.SEVERE, null, ex);
       }
       return p;
   }
}