How to get the available and used memory in mobile using J2ME ?

Ans : You can get the available and used memory in mobile with the help of the java program.
You have create MemoryTest midlet and use the below code in that midlet.

/*--------------------------------------------------
* ShowProperties.java
*
* Example from the book: Core J2ME Technology
* Copyright John W. Muchow http://www.CoreJ2ME.com
* You may use/modify for any non-commercial purpose
*-------------------------------------------------*/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class MemoryTest extends MIDlet
{
private Display display;

public void startApp() throws MIDletStateChangeException
{
display = Display.getDisplay(this);
Form form = new Form("Memory Test");
form.append("Hello Welcome");
form.append("Vendor: " + getAppProperty("MIDlet-Vendor"));
form.append("Description: " + getAppProperty("MIDlet-Description"));
form.append("JadFile Version: " + getAppProperty("JadFile-Version"));
form.append("MIDlet-Data-Size: " + getAppProperty("MIDlet-Data-Size"));
Runtime rtime = Runtime.getRuntime();
form.append("Total memory: " + rtime.totalMemory());
form.append("Free memory: " + rtime.freeMemory());
display.setCurrent(form);
}

public void pauseApp()
{
}

public void destroyApp(boolean unconditional)
{
}
}