Bukkit - EventHandler 方法出错

Question

由于某种原因，我在使用 @EventHandler 注释执行某些操作时收到错误消息。我正在使用 Bukkit 1.7.9。这是我的代码的一部分：

@EventHandler
public void onSignChange(SignChangeEvent event, CommandSender sender, Command cmd, String commandLabel){
    Player player = event.getPlayer();
    if(player.hasPermission("CustomJoinSigns.Create")) {
        if(event.getLine(0).equalsIgnoreCase("Minigame")) {
            player.sendMessage(ChatColor.BLUE + "Please type in the minigame name:");
            player.sendMessage(ChatColor.GOLD + "1)" + ChatColor.RED + "Do " + ChatColor.YELLOW + "/cjs setminigame [Minigame]");
            player.sendMessage(ChatColor.GOLD + "2)" + ChatColor.RED + "Do " + ChatColor.YELLOW + "/cjs cancel");
            if(commandLabel.equalsIgnoreCase("cjs setminigame" + minvar));
            player.sendMessage("Test Successful");
        }
    }
}

这是我的错误日志：

ERROR CustomJoinSigns v1 attempted to register an invalid EventHandler method signature 
"public void me.pvpcraftnetwork.customjoinsigns.Main.onSignChange(org.bukkit.event.block.SignChangeEvent,org.bukkit.command.CommandSender,org.bukkit.command.Command,java.lang.String)"
in class me.pvpcraftnetwork.customjoinsigns.Main

对我做错了什么有什么建议吗？

Answer 1

Listener 方法中只能有一个参数。它应该是这样的：

@EventHandler
public void onSignChange(SignChangeEvent event){
  Player player = event.getPlayer();
  if(player.hasPermission("CustomJoinSigns.Create")) {
    if(event.getLine(0).equalsIgnoreCase("Minigame")) {
        player.sendMessage(ChatColor.BLUE + "Please type in the minigame name:");
        player.sendMessage(ChatColor.GOLD + "1)" + ChatColor.RED + "Do " + ChatColor.YELLOW + "/cjs setminigame [Minigame]");
        player.sendMessage(ChatColor.GOLD + "2)" + ChatColor.RED + "Do " + ChatColor.YELLOW + "/cjs cancel");
        if(commandLabel.equalsIgnoreCase("cjs setminigame" + minvar));
        player.sendMessage("Test Successful");
    }
  }
}

CommandSender sender, Command cmd, String commandLabel 参数用于命令中...所以也许你认为注册事件就像监听玩家何时运行命令？

同样，所有@EventHandler 方法只能有一个参数，即您正在侦听的事件。所以如果你正在收听PlayerJoinEvent，你会使用：

@EventHandler
public void playerJoin(PlayerJoinEvent event){
  //code here
}