Commands - Bukkit Coding Episode 2

package me.TheBmanSwan.Commands;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

/**
 * **********************************************************
 * Project: BukkitTutorials
 * Copyright TheBmanSwan (c) 2015. All Rights Reserved.
 * Upon using this for commercial use, the user must give
 * credit to TheBmanSwan. Distribution of the code is allowed
 * Claiming this project to be created by you is strictly prohibited.
 * **********************************************************
 */
public class Main extends JavaPlugin {

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if (!(sender instanceof Player)) {
            sender.sendMessage(ChatColor.GREEN+"You ran the command in the console!");
            return true;
        }

        Player p = (Player) sender;

        if (label.equalsIgnoreCase("command")) {
            p.sendMessage(ChatColor.GREEN+"You ran the command in-game!");
        }

        return true;
    }
}