Code

package me.philitup321.InfinityRealms;

import java.util.Arrays;
import java.util.logging.Logger;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Item;
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.block.SignChangeEvent;
import org.bukkit.event.player.PlayerDropItemEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;

public class InfinityRealms extends JavaPlugin implements Listener{
    public final Logger logger = Logger.getLogger("Minecraft");
    public static InfinityRealms plugin;
    public void join(PlayerJoinEvent event) {
        ItemStack emerald = new ItemStack(Material.EMERALD, 1);
        ItemMeta em = emerald.getItemMeta();
        em.setDisplayName(ChatColor.GREEN + "RealmShop");
        em.setLore(Arrays.asList(ChatColor.RED + "Click to visit the RealmShop!"));
        emerald.setItemMeta(em);
        event.getPlayer().getInventory().clear();
        event.getPlayer().getInventory().setItem(7, emerald);
        ItemStack star = new ItemStack(Material.NETHER_STAR, 1);
        ItemMeta st = star.getItemMeta();
        st.setDisplayName(ChatColor.AQUA + "Lobby");
        st.setLore(Arrays.asList(ChatColor.RED + "Click to return to the Hub!"));
        star.setItemMeta(st);
        event.getPlayer().getInventory().setItem(8, star);
}



    @EventHandler
    public void EmeraldClick(PlayerInteractEvent event){
          Player player = event.getPlayer();
          if(event.getAction().equals(Action.RIGHT_CLICK_AIR) || player.getItemInHand().getType() == Material.EMERALD){
              if(player.getItemInHand().getType().equals(Material.EMERALD)){
                  player.teleport(new Location(Bukkit.getWorld("Server"), -167, 81, 1770));
                  player.sendMessage(ChatColor.GREEN + "Welcome to the RealmShop!!");
              }


              }
    }


    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {
        Player player = (Player) sender;
        if(cmd.getName().equalsIgnoreCase("RealmShops")){
            player.sendMessage(ChatColor.GREEN + "Types of RealmSigns:" + ChatColor.GOLD + " Pig, Trail. TF2, and Fly." + ChatColor.DARK_GREEN + " To create a RealmSign, make a sign with one of these words on the first line.");

        }

    return true;
   }

     @EventHandler
        public void onEmeraldDrop (PlayerDropItemEvent e) {
         Player p = e.getPlayer();
         PlayerInventory playerInventory = p.getInventory();
            if (p.isOnline()) {
                Item drop = e.getItemDrop();
                if (drop.getItemStack().getTypeId() == 388) {
                e.setCancelled(true);
                }
                if(playerInventory.getHeldItemSlot() == 7) {
            }
        }
}

     @EventHandler
        public void onStarDrop(PlayerDropItemEvent e) {
         Player p = e.getPlayer();
      PlayerInventory playerInventory = p.getInventory();
            if (p.isOnline()) {
                Item drop = e.getItemDrop();
                if (drop.getItemStack().getTypeId() == 399) {
                e.setCancelled(true);
                }
                if(playerInventory.getHeldItemSlot() == 8) {
            }
        }
}
        public void signTF2(SignChangeEvent sign) {
            Player player = sign.getPlayer();
            if(sign.getLine(0).equalsIgnoreCase("TF2")){
                player.sendMessage(ChatColor.RED + "RealmsShop Sign Created!");
                sign.setLine(0, ChatColor.BOLD + "[RealmShop]");
                sign.setLine(1, "(TF2)");
                sign.setLine(2, ChatColor.YELLOW + "Premium Classes");
                sign.setLine(3, ChatColor.ITALIC + "10,000 Coins");
            }
        }

        @EventHandler
        public void signFly(SignChangeEvent sign) {
            Player player = sign.getPlayer();
            if(sign.getLine(0).equalsIgnoreCase("fly")){
                player.sendMessage(ChatColor.RED + "RealmsShop Sign Created!");
                sign.setLine(0, ChatColor.BOLD + "[RealmShop]");
                sign.setLine(1, "(Utilities)");
                sign.setLine(2, ChatColor.YELLOW + "Fly");
                sign.setLine(3, ChatColor.ITALIC + "15,000 Coins");
            }
        }

        @EventHandler
        public void signTrail(SignChangeEvent sign) {
            Player player = sign.getPlayer();
            if(sign.getLine(0).equalsIgnoreCase("trail")){
                player.sendMessage(ChatColor.RED + "RealmsShop Sign Created!");
                sign.setLine(0, ChatColor.BOLD + "[RealmShop]");
                sign.setLine(1, "(Trails)");
                sign.setLine(2, ChatColor.YELLOW + "Rainbow Trail");
                sign.setLine(3, ChatColor.ITALIC + "15,000 Coins");
            }
        }

        @EventHandler
        public void signDomination(SignChangeEvent sign) {
            Player player = sign.getPlayer();
            if(sign.getLine(0).equalsIgnoreCase("dom")){
                player.sendMessage(ChatColor.RED + "RealmsShop Sign Created!");
                sign.setLine(0, ChatColor.BOLD + "[RealmShop]");
                sign.setLine(1, "(Domination)");
                sign.setLine(2, ChatColor.DARK_RED + "Coming Soon...");
            }
        }

        @EventHandler
        public void signBalance(SignChangeEvent sign) {
            Player player = sign.getPlayer();
            if(sign.getLine(0).equalsIgnoreCase("bal")){
                player.sendMessage(ChatColor.RED + "RealmsShop Sign Created!");
                sign.setLine(0, ChatColor.BOLD + "[RealmShop]");
                sign.setLine(1, ChatColor.RED + "Balance");
            }
        }

        @EventHandler
        public void signBalance1(SignChangeEvent sign) {
            Player player = sign.getPlayer();
            if(sign.getLine(0).equalsIgnoreCase("balance")){
                player.sendMessage(ChatColor.RED + "RealmsShop Sign Created!");
                sign.setLine(0, ChatColor.BOLD + "[RealmShop]");
                sign.setLine(1, ChatColor.RED + "Balance");
            }
        }

}