Memperoleh jumlah memori yang tersedia pada JAVA (J2ME)

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class JumlahMemori extends MIDlet
  implements CommandListener {
   
  private Display display;
  private Form form;

  private final Command cmdKeluar =
    new Command("Keluar", Command.EXIT, 1);
 
  public JumlahMemori() {
    display = Display.getDisplay(this);
   
    form = new Form("Jumlah Memori");
       
    form.addCommand(cmdKeluar);
    form.setCommandListener(this);   
  }   

  public void startApp() {
    Runtime runtime = Runtime.getRuntime();
    runtime.gc();
    long total = runtime.totalMemory();
    long bebas = runtime.freeMemory();
   
    StringBuffer sb = new StringBuffer();
    sb.append("Memori total: " + total + " byte\n");
    sb.append("Memori bebas: " + bebas + " byte");      
   
    form.append(sb.toString());
    display.setCurrent(form);
  }
   
  public void pauseApp() {
  }
   
  public void destroyApp(boolean unconditional) {
  }
   
  public void commandAction(Command c, Displayable s) {
    if (c == cmdKeluar) {
      destroyApp(false);
      notifyDestroyed();
    }   
  }   
}