Test.java

package mrwaffleman.me;

import org.bukkit.Bukkit;
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;

public class Test extends JavaPlugin {
    public void onEnable() {
        Bukkit.getServer().getLogger().info("BukkitTutorial has been activated!");
    }
    public void onDisable() {
        Bukkit.getServer().getLogger().info("BukkitTutorial has been deactivated!");
    }

    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {
        if(!(sender instanceof Player)) {
            sender.sendMessage(ChatColor.GREEN + "This plugin is working, Console!");
            return true;
        }

        Player player = (Player) sender;

        if(cmd.getName().equalsIgnoreCase("Test")) {
            player.sendMessage(ChatColor.AQUA + "This plugin is working, Player!");
        }
        return true;
    }
}