Code 2

package me.YouTubeDanTDM.menuinv;

import java.util.Arrays;

import org.bukkit.Bukkit;
import org.bukkit.DyeColor;
import org.bukkit.GameMode;
import org.bukkit.entity.Player;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.material.Wool;

public class MenuInv {

    private Inventory inv;
	private ItemStack c, s, a,

	public Menu(Plugin p) {
		inv = Bukkit.getServer().createInventory(null, 9"GameMode Chooser");


		c = createItem(DyeColor.YELLOW, "Creative");
		s = createItem(DyeColor.GREEN, "Suvival");
		a = createItem(DyeColor.RED "Adventure");

		inv.setItem(2, c);
		inv.setItem(4, s);
		inv.setItem(6, a);

        Bukkit.getServer().getPluginManager().registerEvent(this, p);
	}

	privare ItemStack createItem(DyeColor dc, String name) {
		ItemStack i = new Wool(dc).toItemStack(1);
		ItemMeta im = i.getItemMeta();
		im.setLore(Arrays.asList("Set your gamemode", "to " + name.toLowerCase() + " mode"));
		i.setItemMeta(im);
		return i;
	}

	public void show(Player p) {
		p.openInventory(inv)
	}

    @EventHandler
    public void onInventoryClick(InventoryClickEvent e) {
    	if (!e.getInventory().equals(inv)) return;
    	if (e.getCurrentItem().getItemMeta().getDisplayName().contains("Creative")) {
    		e.getWhoClicked().setGameMode(GameMode.CREATIVE);

    		if (e.getCurrentItem().getItemMeta().getDisplayName().contains("Survival")) {
        		e.getWhoClicked().setGameMode(GameMode.SURVIVAL);

        		if (e.getCurrentItem().getItemMeta().getDisplayName().contains("Adventure")) {
            		e.getWhoClicked().setGameMode(GameMode.ADVENTURE);
    	}
    }
}