New code!

package me.neil.serverkits;

import java.util.logging.Logger;

import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.block.Sign;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.enchantments.EnchantmentWrapper;
import org.bukkit.entity.EntityType;
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.entity.PlayerDeathEvent;
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.plugin.PluginDescriptionFile;
import org.bukkit.plugin.java.JavaPlugin;
//import org.bukkit.block.Sign;
//import org.bukkit.enchantments.Enchantment;
//import org.bukkit.enchantments.EnchantmentWrapper;
//import org.bukkit.inventory.ItemStack;
//import org.bukkit.inventory.PlayerInventory;

public class ServerKits extends JavaPlugin implements Listener{
    String Kit;
    @EventHandler
    public void onPlayerLogin(PlayerJoinEvent event){
        Player joinedPlayer = event.getPlayer();
        String playerName = event.getPlayer().getName();
        if (!(joinedPlayer.hasPlayedBefore())) {
            joinedPlayer.sendMessage(ChatColor.GOLD+"Welcome "+playerName+", this is a ServerKits server, choose your kits wisely! You're current kit: standard");
            setLevel(joinedPlayer,0);
        }else{
             joinedPlayer.sendMessage("Welcome back, " +playerName + "!");
         }
    }



    public void PlayerDeathEvent(PlayerDeathEvent event){
        Player player = event.getEntity();
        event.setDeathMessage("hi "+player);
        if (event.getEntityType() == EntityType.PLAYER) {

        }


    }
    @EventHandler
    public void onSignCreate(SignChangeEvent sign){

        Player player = sign.getPlayer();
        if(sign.getLine(0).equalsIgnoreCase("[KIT]")){
                player.sendMessage(ChatColor.GOLD+"Successfully created a ServerKits KIT sign!");
                sign.setLine(0,"§1[KIT]");

            }
        if(sign.getLine(0).equalsIgnoreCase("[MAP]")){
            player.sendMessage(ChatColor.GOLD+"Successfully created a ServerKits MAP sign!");
            sign.setLine(0,"§1[MAP]");
        }
        }


    @EventHandler
    public void onPlayerInteract(PlayerInteractEvent event) {//onPlayerInteract method.
    Player player = event.getPlayer(); //Get player
    if (event.getAction() == Action.RIGHT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_BLOCK && player.getItemInHand()!=null && player.getItemInHand().getType() == Material.MUSHROOM_SOUP && player.getHealth()!=20) {
    player.setHealth(player.getHealth()+5);
    event.getPlayer().getItemInHand().setType(Material.BOWL);

    }else if(event.getAction() == Action.RIGHT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_BLOCK && player.getItemInHand()!=null && player.getItemInHand().getType() == Material.MUSHROOM_SOUP && player.getHealth()==20){
        player.sendMessage(ChatColor.RED+"You have full health!");
    }

    if (event.getClickedBlock().getState() instanceof Sign){
        if(event.getClickedBlock().getType() == Material.SIGN || event.getClickedBlock().getType() == Material.SIGN_POST || event.getClickedBlock().getType() == Material.WALL_SIGN) {
        Sign sign = (Sign) event.getClickedBlock().getState();
        if(sign.getLine(0).contains("[KIT]")){
            if(sign.getLine(1).equalsIgnoreCase("Standard")){
            player.sendMessage("You have recieved kit " +ChatColor.RED+"Standard");
            giveKit(player,1);
            }
        }
        }
    }

    }//End of onPlayerInteract Method.



    public static ServerKits plugin;
    public final Logger logger = Logger.getLogger("minecraft");
    public void onEnable(){
         PluginDescriptionFile pdfFile = this.getDescription();
         getServer().getPluginManager().registerEvents(this, this);
         this.logger.info(pdfFile.getName()+" version "+pdfFile.getVersion() + " has been enabled!");
    }
    public void onDisable(){
        PluginDescriptionFile pdfFile = this.getDescription();
        this.logger.info(pdfFile.getName()+" version "+pdfFile.getVersion() + "has been disabled!");
    }


    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String []args){
        Player player = (Player) sender;
        if(commandLabel.equalsIgnoreCase("heal") && player.hasPermission("serverkits.heal")){
            if(args.length == 0){
            player.sendMessage("Healed yourself!");
            player.setHealth(20);
            return true;
            }else if(args.length ==1 && player.hasPermission("serverkits.heal.others")){
                Player targetPlayer = player.getServer().getPlayer(args[0]);
                player.sendMessage(ChatColor.GOLD+ targetPlayer.getPlayer().getName()+" has been healed");
                targetPlayer.sendMessage(ChatColor.GOLD+"You have been healed.");
                targetPlayer.setHealth(20);
                return true;
            }

    }
    if(commandLabel.equalsIgnoreCase("diamondkit")){
        player.sendMessage("Diamond kid given!");
        player.setHealth(0);
        return true;
    }
        return false;





}

    public void setLevel(Player player, int level){
        player.setDisplayName("["+level+"] "+player.getDisplayName());
    }
    @SuppressWarnings("deprecation")
    public void giveKit(Player person, int KitID){
        //Standard:
        Player player = person;
        PlayerInventory inventory = player.getInventory(); // The player's inventory
        Enchantment prot = new EnchantmentWrapper(0);
        Enchantment s = new EnchantmentWrapper(16);
        ItemStack diamondsword = new ItemStack(Material.DIAMOND_SWORD, 1);
        ItemStack ironchestplate = new ItemStack(Material.IRON_CHESTPLATE, 1);
        ironchestplate.addEnchantment(prot, 1);
        ItemStack ironleggings = new ItemStack(Material.IRON_LEGGINGS, 1);
        ironleggings.addEnchantment(prot, 1);
        ItemStack ironboots = new ItemStack(Material.IRON_BOOTS, 1);
        ironboots.addEnchantment(prot, 1);
        ItemStack ironhelmet = new ItemStack(Material.IRON_HELMET, 1);
        ironhelmet.addEnchantment(prot, 2);
        ItemStack food = new ItemStack(Material.GRILLED_PORK, 32);
        diamondsword.addEnchantment(s, 1);

        if(KitID==1){
        if(!(inventory.contains(food) && inventory.contains(diamondsword) && inventory.getHelmet().equals(ironhelmet) && inventory.getChestplate().equals(ironchestplate) && inventory.getLeggings().equals(ironleggings) && inventory.getBoots().equals(ironboots))){
            inventory.setHelmet(ironhelmet);
            inventory.setChestplate(ironchestplate);
            inventory.setLeggings(ironleggings);
            inventory.setBoots(ironboots);
            inventory.addItem(diamondsword,food);
            player.updateInventory();
        }
        }
    }

}