Adding sound to game application

Question

Can anyone assist me or provide a link as to how I can add sound to an application(non-applet)? In this case it is a space invaders clone tutorial; now I would like to add sound to when either the player or the aliens fire a laser. The problem is that I'm not sure how to do it. I initially tried using the AudioStream attribute from the sun.audio class but it did not work. Also I would like to add new images to the game background but when I add images to the panel, it does not appear when executed; the game loop I think affects this. Here is some code snippets:
The initial setup function:
public Game() {
          //ImagePanel p1 = new ImagePanel(new ImageIcon("City.png").getImage());
          // create a frame to contain our game
          JFrame container = new JFrame("Space Invaders 101");
          // get hold the content of the frame and set up the resolution of the game
          JPanel panel = (JPanel) container.getContentPane();
          panel.setPreferredSize(new Dimension(800,600));
          panel.setLayout(null);
          // setup our canvas size and put it into the content of the frame
          setBounds(0,0,800,600);
          panel.add(this);
          // Tell AWT not to bother repainting our canvas since we're
          // going to do that our self in accelerated mode
          setIgnoreRepaint(true);
          // finally make the window visible
          container.pack();
          container.setResizable(false);
          container.setVisible(true);
          // add a listener to respond to the user closing the window. If they
          // do we'd like to exit the game
          container.addWindowListener(new WindowAdapter() {
               public void windowClosing(WindowEvent e) {
                    System.exit(0);
          // add a key input system (defined below) to our canvas
          // so we can respond to key pressed
          addKeyListener(new KeyInputHandler());
          // request the focus so key events come to us
          requestFocus();
          // create the buffering strategy which will allow AWT
          // to manage our accelerated graphics
          createBufferStrategy(2);
          strategy = getBufferStrategy();
          // initialise the entities in our game so there's something
          // to see at startup
          initEntities();
     }then the class for firing a shot:
public class ShotEntity extends Entity {
     /** The vertical speed at which the players shot moves */
     private double moveSpeed = -300;
     /** The game in which this entity exists */
     private Game game;
     /** True if this shot has been "used", i.e. its hit something */
     private boolean used = false;
      * Create a new shot from the player
      * @param game The game in which the shot has been created
      * @param sprite The sprite representing this shot
      * @param x The initial x location of the shot
      * @param y The initial y location of the shot
     public ShotEntity(Game game,String sprite,int x,int y) {
          super(sprite,x,y);
          this.game = game;
          dy = moveSpeed;
      * Request that this shot moved based on time elapsed
      * @param delta The time that has elapsed since last move
     public void move(long delta) {
          // proceed with normal move
          super.move(delta);
          // if we shot off the screen, remove ourselfs
          if (y < -100) {
               game.removeEntity(this);
      * Notification that this shot has collided with another
      * entity
      * @parma other The other entity with which we've collided
     public void collidedWith(Entity other) {
          // prevents double kills, if we've already hit something,
          // don't collide
          if (used) {
               return;
          // if we've hit an alien, kill it!
          if (other instanceof AlienEntity) {
               // remove the affected entities
               game.removeEntity(this);
               game.removeEntity(other);
               // notify the game that the alien has been killed
               game.notifyAlienKilled();
               used = true;
}The main game loop:
public void gameLoop() {
          long lastLoopTime = System.currentTimeMillis();
          // keep looping round til the game ends
          while (gameRunning) {
               // work out how long its been since the last update, this
               // will be used to calculate how far the entities should
               // move this loop
               long delta = System.currentTimeMillis() - lastLoopTime;
               lastLoopTime = System.currentTimeMillis();
               // Get hold of a graphics context for the accelerated
               // surface and blank it out
               Graphics2D g = (Graphics2D) strategy.getDrawGraphics();
               g.setColor(Color.black);
               g.fillRect(0,0,800,600);
               // cycle round asking each entity to move itself
               if (!waitingForKeyPress) {
                    for (int i=0;i<entities.size();i++) {
                         Entity entity = (Entity) entities.get(i);
                         entity.move(delta);
               // cycle round drawing all the entities we have in the game
               for (int i=0;i<entities.size();i++) {
                    Entity entity = (Entity) entities.get(i);
                    entity.draw(g);
               // brute force collisions, compare every entity against
               // every other entity. If any of them collide notify
               // both entities that the collision has occured
               for (int p=0;p<entities.size();p++) {
                    for (int s=p+1;s<entities.size();s++) {
                         Entity me = (Entity) entities.get(p);
                         Entity him = (Entity) entities.get(s);
                         if (me.collidesWith(him)) {
                              me.collidedWith(him);
                              him.collidedWith(me);
               // remove any entity that has been marked for clear up
               entities.removeAll(removeList);
               removeList.clear();
               // if a game event has indicated that game logic should
               // be resolved, cycle round every entity requesting that
               // their personal logic should be considered.
               if (logicRequiredThisLoop) {
                    for (int i=0;i<entities.size();i++) {
                         Entity entity = (Entity) entities.get(i);
                         entity.doLogic();
                    logicRequiredThisLoop = false;
               // if we're waiting for an "any key" press then draw the
               // current message
               if (waitingForKeyPress) {
                    g.setColor(Color.white);
                    g.drawString(message,(800-g.getFontMetrics().stringWidth(message))/2,250);
                    g.drawString("Press any key",(800-g.getFontMetrics().stringWidth("Press any key"))/2,300);
               // finally, we've completed drawing so clear up the graphics
               // and flip the buffer over
               g.dispose();
               strategy.show();
               // resolve the movement of the ship. First assume the ship
               // isn't moving. If either cursor key is pressed then
               // update the movement appropraitely
               ship.setHorizontalMovement(0);
               if ((leftPressed) && (!rightPressed)) {
                    ship.setHorizontalMovement(-moveSpeed);
               } else if ((rightPressed) && (!leftPressed)) {
                    ship.setHorizontalMovement(moveSpeed);
               // if we're pressing fire, attempt to fire
               if (firePressed) {
                    tryToFire();
               // finally pause for a bit. Note: this should run us at about
               // 100 fps but on windows this might vary each loop due to
               // a bad implementation of timer
               try { Thread.sleep(10); } catch (Exception e) {}
     

Answer 1

for basic sounds, you can use the JavaSound API.
http://java.sun.com/docs/books/tutorial/sound/index.html
There are plugin libraries available that add MP3 and OGG support to it.
http://www.javazoom.net/index.shtml