How could stop people from taking this item?

Okay so I am making a teleporting plugin. But at the moment you can take the items. How could you stop this?

Code:java

package net.jc.minecraft;
 
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.inventory.InventoryClickEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;
 
public final class Main extends JavaPlugin implements Listener {
    public static Inventory main;
 
    public void onEnable() {
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }
 
    public Main() {
        main = Bukkit.getServer().createInventory(null, 9, "Teleportation");
 
        main.setItem(2, new ItemStack(Material.TNT, 1));
        main.setItem(3, new ItemStack(Material.IRON_AXE, 1));
        main.setItem(4, new ItemStack(Material.NETHER_STAR));
        main.setItem(5, new ItemStack(Material.DIAMOND_SWORD));
        main.setItem(6, new ItemStack(Material.SAND, 1));
 
 
        ItemMeta tnt = main.getItem(2).getItemMeta();
        ItemMeta sg = main.getItem(3).getItemMeta();
        ItemMeta hub = main.getItem(4).getItemMeta();
        ItemMeta survival = main.getItem(5).getItemMeta();
        ItemMeta walls = main.getItem(6).getItemMeta();
 
        tnt.setDisplayName(ChatColor.DARK_RED + "TNTRun");
        sg.setDisplayName(ChatColor.GREEN + "SurvivalGames");
        hub.setDisplayName(ChatColor.YELLOW + "Hub");
        survival.setDisplayName(ChatColor.DARK_RED + "Survival");
        walls.setDisplayName(ChatColor.GREEN + "The Walls");
 
        main.getItem(2).setItemMeta(tnt);
        main.getItem(3).setItemMeta(sg);
        main.getItem(4).setItemMeta(hub);
        main.getItem(5).setItemMeta(survival);
        main.getItem(6).setItemMeta(walls);
    }
 
    @EventHandler
    public void onInventoryClick(InventoryClickEvent e) {
        Player p = (Player) e.getWhoClicked();
        if(!e.getInventory().getName().equalsIgnoreCase(main.getName())) return;
            if(e.getCurrentItem().getItemMeta() == null) return;
                if(e.getCurrentItem().getItemMeta().getDisplayName().contains(ChatColor.DARK_RED + "TNTRun")) {
                    e.setCancelled(true);
                    p.chat("/tntrun");
                    e.getWhoClicked().closeInventory();
                } else if (e.getCurrentItem().getItemMeta().getDisplayName().contains(ChatColor.GREEN + "SurvivalGames")) {
                    e.setCancelled(true);
                    p.chat("/hg");
                    e.getWhoClicked().closeInventory();
                } else if (e.getCurrentItem().getItemMeta().getDisplayName().contains(ChatColor.YELLOW + "Hub")) {
                    e.setCancelled(true);
                    p.chat("/hub");
                    e.getWhoClicked().closeInventory();
                //} else if (e.getCurrentItem().getItemMeta().getDisplayName().contains(ChatColor.DARK_RED + "Survival")) {
                    //e.setCancelled(true);
                    //p.chat("/weatherset");
                    //e.getWhoClicked().closeInventory();
                //} else if (e.getCurrentItem().getItemMeta().getDisplayName().contains(ChatColor.GREEN + "The Walls")) {
                    //e.setCancelled(true);
                    //p.chat("/weatherset");
                    //e.getWhoClicked().closeInventory();
                }
    }
        public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
            if(cmd.getName().equalsIgnoreCase("admin")) {
                if(sender.hasPermission("test")) {
                    Player p = (Player) sender;
                    p.openInventory(main);
                }
            }
            return true;
        }
}

 

PolarCraft

Use these events:
InventoryClickEvent--get the inventory's name and cancel it

And PlayerDropItemEvent--again, check the name and cancel it