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package System;

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class SystemProperties extends MIDlet implements CommandListener
{
private Command esci;

private Display display;

private Form form;

protected void startApp() throws MIDletStateChangeException
{
display = Display.getDisplay(this);

form = new Form("System Propiertis");
form.setCommandListener(this);

esci = new Command("Esci", Command.EXIT, 0);
form.addCommand(esci);

Runtime rt = Runtime.getRuntime();
rt.gc(); // Garbage Collection

form.append("Free Memory: " + rt.freeMemory() + "
");
form.append("Total Memory: " + rt.totalMemory() + "
");
form.append(showProp("microedition.configuration"));
form.append(showProp("microedition.platform"));
form.append(showProp("microedition.locale"));
form.append(showProp("microedition.encoding"));
form.append(showProp("microedition.encodingClass"));
form.append(showProp("microedition.http_proxy"));

display.setCurrent(form);
}

protected void pauseApp()
{

}

protected void destroyApp(boolean unconditional) throws MIDletStateChangeException
{
notifyDestroyed();
}

public String showProp(String str)
{
String value = System.getProperty(str);
StringBuffer stringbuffer = new StringBuffer(50);

stringbuffer.setLength(0);
stringbuffer.append(str);
stringbuffer.append(" = ");

if(value == null)
stringbuffer.append("<undefined>");
else
{
stringbuffer.append(""");
stringbuffer.append(value);
stringbuffer.append(""");
}

stringbuffer.append("
");

return stringbuffer.toString();
}

public void commandAction(Command c, Displayable d)
{
if(c == esci)
{
try
{
destroyApp(true);
}
catch(MIDletStateChangeException e)
{
showException(e);
}
}
}

public void showException(Exception e)
{
Alert alert = new Alert("Errore !!!");
alert.setString(e.getMessage());
alert.setType(AlertType.ERROR);
alert.setTimeout(Alert.FOREVER);

display.setCurrent(alert);
}
}

source