Thank you for your anwser i know that for playing sound i can use AudioClip class but i don't know how. i write this prog. but it didn't work.

import java.applet.*;
import java.awt.*;
import java.awt.event.*;


/*
<applet code="MySound" width=200 height=200>
</applet>
*/

public class MySound extends Applet {


AudioClip audioClip;

public void init()

audioClip = Applet.getAudioClip(getCodeBase(),"gradually.wav");

audioClip.play();
}
}