code to add sound file, where do i enter file path location on this code?

[BEBELINDO]

import java.applet.*; 
import javax.swing.*; 
import java.io.*; 
import java.net.*; 
public class Audioapp extends JApplet 
{ 
        public class Sound // Holds one audio file 
        { 
  private AudioClip song; // Sound player 
  private URL songPath; // Sound path 
  Sound(String filename) 
  { 
         try 
         { 
    songPath = new URL(getCodeBase(),filename); // Get the Sound URL 
    song = Applet.newAudioClip(songPath); // Load the Sound 
         } 
         catch(Exception e){} // Satisfy the catch 
  } 
  public void playSound() 
  { 
         song.loop(); // Play  
  } 
  public void stopSound() 
  { 
         song.stop(); // Stop 
  } 
  public void playSoundOnce() 
  { 
         song.play(); // Play only once 
  } 
        } 
        public void init() 
        { 
  Sound testsong = new Sound("song.mid"); 
  testsong.playSound(); 
        } 
}