GUI Help!

Hey guys! it's me once again with another problem, I am developing a hats plugin, and..
I want to add a gui, so when a player steps on a pressure plate <on a given block> it opens up, and the player can choose the hat they want, and when they choose it, the gui closes.
thanks

My Main Class:

Code:java

package me.ComputerTurtle.Hats;
 
import java.util.logging.Logger;
 
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.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;
 
public class Hats extends JavaPlugin {
    public final Logger logger = Logger.getLogger("minecraft");
    public static Hats plugin;
 
    @Override
    public void onEnable(){
 
    }
 
    @Override
    public void onDisable(){
 
    }
 
    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args){
        Player player = (Player) sender;
        if (cmd.getName().equalsIgnoreCase("Hats")){
            player.sendMessage("-----" + ChatColor.BLUE + " A List Of Hats " + ChatColor.WHITE + "-----");
            player.sendMessage("-----" + ChatColor.BLUE + " Blocks" + ChatColor.WHITE + "-----");
            player.sendMessage(ChatColor.RED + "grass");
            player.sendMessage(ChatColor.RED + "dirt");
            player.sendMessage(ChatColor.RED + "leaves");
            player.sendMessage(ChatColor.RED + "plank");
            player.sendMessage(ChatColor.RED + "wood");
            player.sendMessage(ChatColor.RED + "sand");
            player.sendMessage(ChatColor.RED + "gravel");
            player.sendMessage(ChatColor.RED + "snow");
            player.sendMessage(ChatColor.RED + "ice");
            player.sendMessage(ChatColor.RED + "stone");
            player.sendMessage(ChatColor.RED + "cobble");
            player.sendMessage(ChatColor.RED + "obsidian");
            player.sendMessage("-----" + ChatColor.BLUE + " Ores " + ChatColor.WHITE + "-----");
            player.sendMessage(ChatColor.RED + "iron");
            player.sendMessage(ChatColor.RED + "coal");
            player.sendMessage(ChatColor.RED + "redstone");
            player.sendMessage(ChatColor.RED + "lapis");
            player.sendMessage(ChatColor.RED + "gold");
            player.sendMessage(ChatColor.RED + "diamond");
            player.sendMessage(ChatColor.RED + "emerald");
            player.sendMessage("-----" + ChatColor.BLUE + " Other " + ChatColor.WHITE + "-----");
            player.sendMessage(ChatColor.RED + "workbench");
            player.sendMessage(ChatColor.RED + "netherportal");
            player.sendMessage(ChatColor.RED + "enderportal");
            player.sendMessage(ChatColor.RED + "portalframe");
            player.sendMessage(ChatColor.RED + "pumpkin");
            player.sendMessage(ChatColor.RED + "dispenser");
            player.sendMessage(ChatColor.RED + "furnace");
            player.sendMessage(ChatColor.RED + "lava");
            player.sendMessage(ChatColor.RED + "water");
            player.sendMessage(ChatColor.BLUE + "Scroll UP For More!");
            player.sendMessage(ChatColor.BLUE + "To Remove Hats Do /Hats Clear");
            player.sendMessage(ChatColor.RED + "Hats Plugin Inspired By: Shaz");
            player.sendMessage("WORKING ON INTERNAL ERROR FIX!");
        }
        if (args[0].equalsIgnoreCase("clear")){
            player.sendMessage(ChatColor.RED + "[Hats] " + ChatColor.WHITE +"Hat Cleared");
            player.getInventory().setHelmet(new ItemStack(Material.AIR));
        }   
        return false;
    }
 
}
 

Assist would you be able to help with this and another problem of mine?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

What is the problem?

 

1. I am trying to make it to when a player steps on a pressure plate it opens a GUI, and inside the gui are different blocks, so when a player chooses a block it puts it on the players head, and it closes the GUI

 

I assume that with GUI you mean like an inventory GUI? As used in here?

 

Yes, something like that

 

This would work well https://forums.bukkit.org/threads/icon-menu.108342/

as for opening it I suggest you check if there is a pressure plate at their location then -1 of their y is a certain block on playermoveevent it would open it

 

monkeymanboy ComputerTurtle That's not really the way to check if a player is on a pressure plate, it would be laggy and irreliable. Use a PlayerInteractEvent and check for Action.PHYSICAL, I believe that's how a pressure plate is triggered.