Java-不从HashMap中删除

Question

OK so I have this HashMap

private Map<String, Player> players = new HashMap<String, Player>();

Here is what I use to remove:

      public void destroy() {

players.remove("Red");
os.println(me.getUsername() + "|1|has left|yes|chat");

      }

I say Red because it's just a TEST right now. I will get the eventual correct one later. Anyways...

I use THIS to check.

  if (e.getKeyCode() == KeyEvent.VK_Q) {
            for (Player playert : players.values()) {
                                        c.append("\n < "+playert.getUsername() + " > ");
                        }
                    }

When I'm all by myself.. I press Q and I get:

< Dan >

then my friend Red logs in and I Press Q... I get:

< Dan >
< Red >

then he leaves I press Q and I get:

< Dan >
< Red >

So.. how come this isn't working?

Also, here is the code that gets called in init() when a player logs in the game (starts the applet)

 public void playerLogin() throws IOException {

            Random roll = new Random();
            int newNo = roll.nextInt(200);
            // me.getUsername() = "Guest #" + roll.nextInt(110);
            // String me.getUsername() = getParameter("name");

            me = new Player();
            me.setUsername(getParameter("name"));
            me.setPlayerImage(ImageIO.read(getClass().getResource("me.gif")));
            me.setX(256);
            me.setY(256);
            me.setMap(1);
            me.setCommand("move");
            players.put(me.getUsername(), me);

            repaint();

            System.out.println(me.getUsername() + " was added. player: " + me);
            os.println(me.getUsername() + "|" + me.getX() + "|" + me.getY() + "|"
                        + me.getMap() + "|" + me.getCommand());

            attack = 4;
            defense = 5;
            gold = 542;
            level = 1;
            exp = 53;

      }

Answer 1

In other words, your Applet#destroy() method is not called at the moment you expect it is called? You should use Applet#stop() . The destroy() is only called when the object in question is eligible for GC and/or when the whole browser instance is been closed (and thus not only the current page/tab). JVM may namely keep running as long as the browser instance runs.

Answer 2

When you hit Q... you are checking the contents of players but where is your call to destroy() ? Do you explicitly call destroy() anywhere in your code?