用Java写一个 Bukkit120的 玩家手持的物品为0耐久度花费1000金币可以恢复50耐久度

以下是一个使用Java编写的Bukkit插件，实现了当玩家手持物品耐久度为0时，花费1000金币可以恢复50耐久度的功能：

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
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.PlayerItemHeldEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

public class ItemDurabilityPlugin extends JavaPlugin implements Listener {

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

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (command.getName().equalsIgnoreCase("repair")) {
            if (!(sender instanceof Player)) {
                sender.sendMessage(ChatColor.RED + "Only players can use this command.");
                return true;
            }

            Player player = (Player) sender;
            ItemStack item = player.getInventory().getItemInMainHand();

            if (item.getType() == Material.AIR) {
                player.sendMessage(ChatColor.RED + "You are not holding any item.");
                return true;
            }

            if (item.getDurability() > 0) {
                int cost = 1000;
                int durabilityToRestore = 50;

                if (economy.has(player, cost)) {
                    economy.withdrawPlayer(player, cost);
                    item.setDurability((short) (item.getDurability() - durabilityToRestore));
                    player.sendMessage(ChatColor.GREEN + "Item durability restored by " + durabilityToRestore + ".");
                } else {
                    player.sendMessage(ChatColor.RED + "You don't have enough money to repair the item.");
                }
            } else {
                player.sendMessage(ChatColor.RED + "Item durability is already full.");
            }

            return true;
        }

        return false;
    }

    @EventHandler
    public void onPlayerItemHeld(PlayerItemHeldEvent event) {
        Player player = event.getPlayer();
        ItemStack item = player.getInventory().getItem(event.getNewSlot());

        if (item.getDurability() == 0) {
            player.sendMessage(ChatColor.RED + "Item durability is 0. Use /repair command to restore durability.");
        }
    }
}

请确保在项目中引入了 Vault 和经济插件（如 Essentials 或 Vault 的经济插件），并在 plugin.yml 文件中添加以下内容：

name: ItemDurabilityPlugin
version: 1.0
main: 包名.ItemDurabilityPlugin
api-version: 1.20
commands:
  repair:
    description: Repair the durability of the held item
    usage: /repair

在游戏中，玩家可以使用 /repair 命令来修复手持物品的耐久度。如果物品的耐久度已经为0，玩家会收到一条消息提示。如果玩家拥有足够的金币，耐久度将会恢复，并且金币将会被扣除。如果玩家没有足够的金币，将会收到一条相应的消息提示。