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;
   }
}

List available port in java

import javax.comm.*;
import java.util.Enumeration;

public class ListPorts {

   public static void main(String args[]) {
       Enumeration ports = CommPortIdentifier.getPortIdentifiers();
       while (ports.hasMoreElements()) {
           CommPortIdentifier port = (CommPortIdentifier) ports.nextElement();
           String type;
           switch (port.getPortType()) {
               case CommPortIdentifier.PORT_PARALLEL:
                   type = "Parallel";
                   break;
               case CommPortIdentifier.PORT_SERIAL:
                   type = "Serial";
                   break;
               default:
                    type = "Unknown";
                   break;
           }
           System.out.println(port.getName() + ": " + type);
       }
   }
}

Cara Maximize JFrame

Pada saat membuat JFrame, defaultnya adalah tidak termaximmize. Untuk membuat JFrame termaximize pada saat di panggil caranya adalah dengan memanggil kode di bawah ini. Bisa juga ditambahkan di konstruktor JFame.

setExtendedState(getExtendedState() | javax.swing.JFrame.MAXIMIZED_BOTH);