Java-不从 HashMap 中删除
好的，我有这个 HashMap
private Map<String, Player> players = new HashMap<String, Player>();
这是我用来删除的内容：
public void destroy() {
players.remove("Red");
os.println(me.getUsername() + "|1|has left|yes|chat");
}
我说红色是因为它现在只是一个测试。稍后我会得到最终正确的。无论如何...
我用这个来检查。
if (e.getKeyCode() == KeyEvent.VK_Q) {
for (Player playert : players.values()) {
c.append("\n < "+playert.getUsername() + " > ");
}
}
当我独自一人时..我按Q，我得到：
< Dan >
然后我的朋友Red登录，我按Q...我得到：
< Dan >
< Red >
然后他离开我按Q，我得到：
< Dan >
< Red >
那么..这怎么会是'没工作吗？
另外，这是当玩家登录游戏（启动小程序）时在 init() 中调用的代码
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;
}
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;
}
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评论（2）
换句话说，您的 < code>Applet#destroy() 方法在您期望调用时没有被调用？您应该使用
小程序#stop()。仅当相关对象符合 GC 条件和/或整个浏览器实例关闭（因此不仅仅是当前页面/选项卡）时，才会调用 destroy() 。只要浏览器实例运行，JVM 就可以保持运行。In other words, your
Applet#destroy()method is not called at the moment you expect it is called? You should useApplet#stop(). Thedestroy()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.当您点击 Q...时，您正在检查
players的内容，但是您对destroy()的调用在哪里？您是否在代码中的任何位置显式调用destroy()？When you hit Q... you are checking the contents of
playersbut where is your call todestroy()? Do you explicitly calldestroy()anywhere in your code?