A simple tutorial Bukkit plugin

Tutorial.java

package com.reddit.admincraft.Tutorial;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.world.PlayerJoinEvent;
import org.bukkit.plugin.java.JavaPlugin;


// This defines our Tutorial class as a Bukkit Plugin, and also adds the listener methods
public class Tutorial extends JavaPlugin implements Listener {
  
    // onEnable() is run when Bukkit loads the plugin
    public void onEnable() {
        // we register the listener, which is located in the same class
        getServer().getPluginManager().registerEvents(this, this);
    }
    
    // JavaPlugins have to have onDisable(), and since we don't need it, it's going to be empty
    public void onDisable() {
    }

    // we set the priority to highest, so our plugin has the final say
    @EventHandler(priority = EventPriority.HIGHEST)
    // this is triggered when a player joins the game
    public void onPlayerJoin(PlayerJoinEvent event) {
    	Player player = event.getPlayer();
        // we set the message that is shown here
        event.setJoinMessage(ChatColor.YELLOW + "Hello, " + player.getName() + "!");
    }
}