J2ME System Properties

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() + "\n"); form.append("Total Memory: " + rt.totalMemory() + "\n"); 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(""); else { stringbuffer.append("\""); stringbuffer.append(value); stringbuffer.append("\""); }
stringbuffer.append("\n");
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); }}