http://www.bukkit.fr/topic/19173-probleme-codage/

CensorSheep.java

package fr.neatmonster.censor;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.AsyncPlayerChatEvent;
import org.bukkit.plugin.java.JavaPlugin;

public class CensorSheep extends JavaPlugin implements Listener {
    private final List<String> exprs = Collections.synchronizedList(new ArrayList<String>());

    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);

        exprs.clear();
        exprs.addAll(getConfig().getStringList("words"));
        if (exprs.isEmpty()) {
            exprs.add("Dolly");
            exprs.add("Shrek");
            exprs.add("Lucky");
        }
        getConfig().set("words", exprs);
        saveConfig();
    }

    @Override
    public boolean onCommand(final CommandSender sender, final Command cmd, final String label, final String[] args) {
        if (cmd.getName().equalsIgnoreCase("censor")) {
            if (sender instanceof Player) {
                final Player player = (Player) sender;
                if (args.length == 1 && args[0].equalsIgnoreCase("list")) {
                    String msg = "La liste contient ";
                    synchronized (exprs) {
                        for (final String expr : exprs)
                            msg += "'" + expr + "', ";
                    }
                    player.sendMessage(ChatColor.YELLOW + msg.substring(0, msg.length() - 2));
                } else if (args.length > 1 && args[0].equalsIgnoreCase("add")) {
                    final String expr = String.join(" ", Arrays.asList(args).subList(1, args.length));
                    exprs.add(expr);
                    getConfig().set("words", exprs);
                    saveConfig();
                    player.sendMessage(ChatColor.GREEN + "Added '" + expr + "' to the list.");
                } else if (args.length > 1 && args[0].equalsIgnoreCase("remove")) {
                    final String expr = String.join(" ", Arrays.asList(args).subList(1, args.length));
                    exprs.remove(expr);
                    getConfig().set("words", exprs);
                    saveConfig();
                    player.sendMessage(ChatColor.GREEN + "Removed '" + expr + "' from the list.");
                } else {
                    player.sendMessage(ChatColor.YELLOW + "Usage:");
                    player.sendMessage(ChatColor.YELLOW + "/censor list - lists all expressions");
                    player.sendMessage(ChatColor.YELLOW + "/censor add <expr> - adds an expression");
                    player.sendMessage(ChatColor.YELLOW + "/censor remove <expr> - removes an expression");
                }
            } else
                sender.sendMessage("You're not a sheep, are you a wolf?");
            return true;
        }
        return false;
    }

    @EventHandler(ignoreCancelled = true)
    public void onAsyncPlayerChat(final AsyncPlayerChatEvent event) {
        final String msg = event.getMessage().toLowerCase();
        synchronized (exprs) {
            for (final String expr : exprs)
                if (msg.contains(expr.toLowerCase())) {
                    event.getPlayer().sendMessage(ChatColor.RED + "Bahhhh.");
                    event.setCancelled(true);
                    break;
                }
        }
    }
}