import java.awt.event.MouseEvent;import java.util.ArrayList;import javax.swing.JFrame;import javax.swing.JButton;import java.applet.*;public class Tester{ static ArrayList<Thing> list; 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 static void main(String[] args) throws java.net.MalformedURLException { frame = new JFrame(); frame.setSize(600, 600); frame.setTitle("Main Menu"); frame.getContentPane().setLayout(null); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); startMenu menu = new startMenu(); //This line of code below cannot be found Sound sounds = new Sound(""); menu.pickHumans(); menu.pickRobots(); menu.pickAliens(); frame.remove(menu); frame.setVisible(true); sounds.playSound(); } static JFrame frame;}