Kit GUI help

Alright so I am making a kit GUI, all the kits show up as a Coal item in the GUI but when a player clicks on the Item I have 2 question. 1: How can I change the Coal item to a emerald (If a player clicks the "Kit: 1" Item it will remove the kit: 1 Coal and change it to a emerald) and also 2: How would I make it do different things when they click the different kit items? (I know how to do it if they click a Material in the inventory, But both kits will be coal so can I do different actions if they click a Item with a certain name?)

Thanks!

Heres my code so you can see the kits

Code:java

package me.dc.kits;
 
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.*;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;
 
import java.util.Arrays;
 
public class Main extends JavaPlugin implements Listener {
 
    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
    }
 
    @EventHandler
    public void onPlayerInteract(PlayerInteractEvent e) {
        Player player = e.getPlayer();
 
        Inventory inv = Bukkit.createInventory(null, 27, ChatColor.GOLD + "" + ChatColor.BOLD + "Select your kit!");
 
        ItemStack kit1 = new ItemStack(Material.COAL);
        ItemMeta kit1meta = kit1.getItemMeta();
        kit1meta.setDisplayName(ChatColor.RED + "Kit: 1");
        kit1meta.setLore(Arrays.asList(ChatColor.AQUA + "Price coming soon!"));
 
        kit1.setItemMeta(kit1meta);
 
        ItemStack kit2 = new ItemStack(Material.COAL);
        ItemMeta kit2meta = kit2.getItemMeta();
        kit2meta.setDisplayName(ChatColor.RED + "Kit: 2");
        kit2meta.setLore(Arrays.asList(ChatColor.AQUA + "Price coming soon!"));
 
        kit2.setItemMeta(kit2meta);
 
        inv.setItem(0, kit1);
        inv.setItem(1, kit2);
 
        if (player.getInventory().getItemInHand().getType() != Material.PAPER) return;
 
        if (e.getAction() == Action.RIGHT_CLICK_AIR || e.getAction() == Action.RIGHT_CLICK_BLOCK && player.getItemInHand().getType() == Material.PAPER) {
 
            player.openInventory(inv);
        }
    }
 
}
 

 

For seting to emerald listen on inventory click event and when they click it if it is choral, get its slot and set item in this slot emerald. Preferably have a specific name for each item e ause if they click their inventory coal it will turn it to emerald...

And to do the second thing as I said above, name the item like &7kit 1 and then check if the name is kit1 to do stuff

 

mine-care What do you mean by "name the item"

Edit: Never mind I got it, Thanks!