Sound類封裝了用于播放聲音的方法，手機所能支持的聲音格式和并行播放的數量是和設備相關的，我們可以通過方法supportedFormat = Sound.getSupportedFormats();
Sound.getConcurrentSoundCount()方法得到這些數據。下面提供一個小程序用戶判定我的手機nokia 6108所能支持的聲音類型和并行播放的數量。

package com.j2medev.test;

import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import com.nokia.mid.sound.*;

public class NokiaSound extends MIDlet
{

    PRivate Display display;

    private Form mainForm;

    private int[] supportedFormat;

    protected void startApp() throws MIDletStateChangeException
    {

        initMIDlet();

    }

    public void initMIDlet()
    {
        display = Display.getDisplay(this);
        mainForm = new Form("Nokia Sound");
        supportedFormat = Sound.getSupportedFormats();
        if (supportedFormat.length == 0)
        {
            mainForm.append("No audio format supported!");
        } else
        {
            for (int i = 0; i < supportedFormat.length; i++)
            {
                mainForm.append("" + supportedFormat[i] + " : "
                        + Sound.getConcurrentSoundCount(supportedFormat[i]));
            }
        }
        display.setCurrent(mainForm);
    }

    protected void pauseApp()
    {

    }

    protected void destroyApp(boolean arg0) throws MIDletStateChangeException
    {

    }