Hi, I'm working on a program that needs a dialog box to pop up so the user can select an audio file whenever they click a certain button. Right now my program either freezes while the dialog box is opening, or immediately after the user has selected a file. Can anyone please help me fix this freezing problem?

The code is as follows

import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;

pickAudio audioSelect;
JFileChooser chooser;
audioFileFilter audioFilter;

boolean locked;

//Display font
PFont font;

void setup()
{
 size(800, 600);
 locked = false;
 
 audioSelect = new pickAudio(4, 4);
 //set the display font to courier
 font = createFont("Courier New Bold", 20);
 textFont(font);
}

void draw()
{
 background(255);
 audioSelect.display();
}

void mouseReleased()
{
 if(audioSelect.clicked == true)
 {
   audioSelect.initialize();
 }
 
 locked = false;
 println(audioSelect.path);
}

//Make a file filter for the dialog
//that only takes audio files usable by
//the audio library
class audioFileFilter extends FileFilter
{
 //Give it a label
 String getDescription()
 {
   return "Audio Files";
 }
 
 //Shows what kind of files to show
 boolean accept(File f)
 {
   //get the name of the passed file
   String filename = f.getName();
   //try to find the last in the filename period
   //if no period is found, return an empty string
   //otherwise, return whatever is after the period
   String extension = (filename.lastIndexOf(".")==-1)?"":
   filename.substring(filename.lastIndexOf(".")+1,filename.length());
   
   //if the extension falls under certain audio types, return true
   if(extension.equals("mp3") || extension.equals("wav") ||
   extension.equals("aiff") || extension.equals("au") || extension.equals("snd"))
   {
     return true;
   }
   
   //return true for folders as well
   if(f.isDirectory())
   {
     return true;
   }
   
   //if nothing else returned true, return false
   return false

Whoops, here's the rest of my code. I tried the loop/noLoop thing, but no dice so far.

}

class pickAudio
{
 String path;
 float xpos, ypos, btnX, btnY;
 boolean clicked;
 
 pickAudio()
 {
   path = null;
   btnX = 50;
   btnY = 20;
   xpos = width - (btnX + 5);
   ypos = 5;
   clicked = false;
 }
 
 pickAudio(float sliderNum, float sliderTot)
 {
   path = null;
   btnX = 50;
   btnY = 20;
   xpos = width * (sliderNum / (sliderTot + 1)) - (btnX/2);
   ypos = height - btnY * 1.5;
   clicked = false;
 }
 
 void initialize()
 {
   JFileChooser chooser = new JFileChooser();
   audioFileFilter audioFilter = new audioFileFilter();
   chooser.setFileFilter(audioFilter);
   chooser.removeChoosableFileFilter(chooser.getAcceptAllFileFilter());
   
   int returnVal = chooser.showOpenDialog(null);

   //print the path to the console
   if(returnVal == JFileChooser.APPROVE_OPTION)
   {
     String path = chooser.getSelectedFile().getAbsolutePath();
     println("File path: " + path);
   }
 }
 
 void display()
 {
   click();
   
   stroke(0);
   strokeWeight(2);
   
   if(clicked)
   {
     fill(200);
   }
   else
   {
     fill(150);
   }
   
   rect(xpos, ypos, btnX, btnY);

   fill(0);
   textSize(15);
   text("Music", xpos + 3, ypos + btnY * .7);
 }
 
 //called to check if the user is clicking the button
 boolean click()
 {
   if(locked && !clicked)
   {
     return false;
   }
   
   if((overRect(xpos, ypos, btnX, btnY) && mousePressed)
     || clicked == true)
   {
     clicked = true;
     locked = true;
     return true;
   }
   else
   {
     return false;
   }
 }
}

//FUNCTION TAKEN FROM THE HANDLES EXAMPLE FROM PROCESSING.ORG
boolean overRect(float x, float y, float width, float height)
{
 if (mouseX >= x && mouseX <= x+width &&
   mouseY >= y && mouseY <= y+height)
 {
   return true;
 }
 else
 {
   return false;
 }
}