Tutorial - Blockhead's Bukkit Coding

package me;

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

public class Tutorial extends JavaPlugin{

    public void onEnable(){
        getServer().getLogger().info("Tutorial has started");

    }

    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args){

        if (cmd.getName().equalsIgnoreCase("hello")){
            sender.sendMessage(ChatColor.YELLOW + "Hello, " + sender.getName());

            return true;
        }


        return true;
    }

}