Question Lightning on right-click?

I'm new to developing plugins and I decided to make a kit pvp plugin for my server. I want a Zeus kit. I want it so the if you right-click a diamond axe it would strike lightning at the player or the ground where you're looking. Can someone help me with the code?

Here is the Zeus class:

Code:

package me.exellanix.kitpvp.commands;

import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;

public class Zeus implements CommandExecutor {

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if (label.equalsIgnoreCase("zeus"))
            if (!(sender instanceof Player)) {
                sender.sendMessage("You must be a player to execute this command!");

                return false;
            }

        Player player = (Player) sender;
        PlayerInventory inv = player.getInventory();
        // clears player inv
        inv.clear();

        ItemStack diamondAxe = new ItemStack(Material.DIAMOND_AXE);
        ItemStack mushroomStew = new ItemStack(Material.MUSHROOM_SOUP, 35);
        ItemStack ironHelmet = new ItemStack(Material.DIAMOND_SWORD);
        ItemStack ironChestplate = new ItemStack(Material.DIAMOND_SWORD);
        ItemStack ironLeggings = new ItemStack(Material.DIAMOND_SWORD);
        ItemStack ironBoots = new ItemStack(Material.DIAMOND_SWORD);

        diamondAxe.addEnchantment(Enchantment.DAMAGE_ALL, 2);

        inv.addItem(diamondAxe, mushroomStew);
        inv.setHelmet(ironHelmet);
        inv.setChestplate(ironChestplate);
        inv.setLeggings(ironLeggings);
        inv.setBoots(ironBoots);

        player.sendMessage(ChatColor.GOLD + "You have chosen the kit " + ChatColor.YELLOW + "Zeus");

        return true;

    }
}

 

Here you are the event of right clicking with a diamond axe:

Code:

@EventHandler
    public void onPlayerInteract(PlayerInteractEvent e) {
        Player p = e.getPlayer();
        if(p.getItemInHand().getType() == Material.DIAMOND_AXE && (e.getAction() == Action.RIGHT_CLICK_BLOCK || e.getAction() == Action.RIGHT_CLICK_AIR)) {
            int MaxRange = 25;
            for(Block b : p.getLineOfSight((HashSet<Byte>) null, MaxRange)) {
                if(b.getType() != Material.AIR) {
                    p.getWorld().strikeLightning(b.getLocation());
                    return;
                }
            }
        }
}

 

Thank you so much!
But now how can I add a cool down of like 20 seconds?

 

Try to find on internet before ask in forums. I've found that in the first page of google: https://bukkit.org/threads/how-do-i-make-a-command-cooldown-for-my-plugin.102299/.