Simple Java - Minecraft Plugin a command

package you.yourcode.Command;
//REMEMBER YOU NEED A PLUGIN YML TO LOAD THE COMMANDS!
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;

public class Command extends JavaPlugin {


    @Override
    public void onDisable() {
        System.out.println("[Command] Plugin deaktiviert!");

    }

    @Override
    public void onEnable() {
        //laden von Event Dingsta
        registerEvent();
        PluginDescriptionFile descFile = this.getDescription();
        System.out.println("[Command] Code written by _chunk__");
        System.out.println("[Command] Version: " + descFile.getVersion());
        System.out.println("[Command] Write what you want!");


    }

    public boolean onCommand(CommandSender sender, Command cmd, String cmdLabel, String[] args){
        boolean erfolg = false;



        Player p = (Player)sender;

        if(cmd.getName().equalsIgnoreCase("YOURINGAMECOMMAND")){
            if(args.length == 0){
                float health = p.getHealth();
                p.sendMessage(ChatColor.RED + "[Command] " + ChatColor.AQUA + "Deine Gesundheit: " + health);
                p.setHealth(20);
                p.sendMessage(ChatColor.RED + "[Command] " + ChatColor.AQUA + "Du wurdest geheilt!");
                p.addPotionEffect(new PotionEffect(PotionEffectType.HUNGER, 500, 1));

                erfolg = true;
            }
            else
            {
            erfolg = false;
            }
        }




        return erfolg;
    }

    //Event-Teil
    private void registerEvent(){

    }

}