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+package com.expir3dcow.GUI;%0A%0Aimport org.bukkit.Bukkit;%0Aimport org.bukkit.Material;%0Aimport org.bukkit.command.Command;%0Aimport org.bukkit.command.CommandSender;%0Aimport org.bukkit.entity.Player;%0Aimport org.bukkit.event.EventHandler;%0Aimport org.bukkit.event.Listener;%0Aimport org.bukkit.event.inventory.InventoryClickEvent;%0Aimport org.bukkit.inventory.Inventory;%0Aimport org.bukkit.inventory.ItemStack;%0Aimport org.bukkit.plugin.java.JavaPlugin;%0A%0Apublic class KitGUI extends JavaPlugin implements Listener %7B%0A%09public Inventory inv;%0A%09%0A%09%0A%09public void onEnable()%7B%0A%09%09this.getServer().getPluginManager().registerEvents(this, this);%0A%09%09%7D%0A%09%0A%09%0A%09%0A%09public void openGUI(Player p)%7B%0A%09    inv = Bukkit.createInventory(null, 9, %22Kit GUI%22);%0A%09    inv.setItem(0, new ItemStack(Material.DIAMOND) );%0A%09    p.openInventory(inv);%0A%09%7D%0A%09%0A%09%0A%09%0A%09%0A%09 @EventHandler%0A%09    public void InventoryClick(InventoryClickEvent e)%7B%0A%09        Player p = (Player) e.getWhoClicked();  %0A%0A%09        if(e.getInventory().getTitle().contains(%22Kit GUI%22))%7B%0A%09            e.setCancelled(true);%0A%0A%09            if(e.getCurrentItem() == null)%7B%0A%09                return;%0A%09            %7D%0A%09            else if(e.getCurrentItem().getType() == Material.DIAMOND)%7B%0A%09            p.sendMessage(%22You clicked the diamond!%22);%0A%09            p.closeInventory();%0A%09            %7D%0A%09       %7D%0A%09  %7D%0A%09 %0A%09%0A%09 %0A%09 %0A%09 @Override%0A%09 public boolean onCommand(CommandSender sender, Command cmd, String label, String%5B%5D args) %7B%0A%09 %09if (cmd.getName().equalsIgnoreCase(%22kits%22)) %7B%0A%09 %09%09openGUI( (Player)sender);%0A%09 %09%09return true;%0A%09 %09%09%7D%0A%09 %09return true;%0A%09 %7D%0A%09 %0A%7D%0A

Create KitGUI.java