Java播放音频内存溢出问题

这样一个小程序
//音乐盒，通过下拉列表来选择音乐

import javax.swing.*;

public class JukeBox
{
public static void main (String[] args) throws Exception
{
JFrame frame=new JFrame("JukeBox");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.getContentPane().add(new JukeBoxControls());

frame.pack();
frame.setVisible(true);
}
}
//控制面板

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.AudioClip;
import java.net.URL;

public class JukeBoxControls extends JPanel
{
private JComboBox musicCombo;
private JButton stopButton,playButton;
private AudioClip[] music;
private AudioClip current;

public JukeBoxControls()
{
URL url1,url2,url3,url4,url5,url6,url;
url1=url2=url3=url4=url5=url6=null;

try
{
url1=new URL("file","localhost","The climb.wav");
url2=new URL("file","localhost","Burning-Maria Arredondo.wav");
url3=new URL("file","localhost","You Are Not Alone-Michael.wav");
url4=new URL("file","localhost","Love Story-Taylor Swift.wav");
url5=new URL("fi