Neil's plugin

package me.neil.serverkits;

import java.util.logging.Logger;

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.plugin.java.JavaPlugin;

public class ServerKits extends JavaPlugin{

    @EventHandler
    public void onPlayerLogin(PlayerJoinEvent event){
        Player joinedPlayer = event.getPlayer();
        joinedPlayer.sendMessage("hi!");
    }

    public static ServerKits plugin;
    public final Logger logger = Logger.getLogger("minecraft");
    public void onEnable(){
        PluginDescriptionFile pdfFile = this.getDescription();
        this.logger.info(pdfFile.getName()+" version "+pdfFile.getVersion() + "has been enabled!");
    }
    public void onDisable(){
        PluginDescriptionFile pdfFile = this.getDescription();
        this.logger.info(pdfFile.getName()+" version "+pdfFile.getVersion() + "has been disabled!");
    }


    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String []args){
        Player player = (Player) sender;
        if(commandLabel.equalsIgnoreCase("heal")){
            if(args.length == 0){
            player.sendMessage("Healed yourself!");
            player.setHealth(20);
            return true;
            }else if(args.length ==1){
                player.sendMessage("Healed yourself!");
                Player targetPlayer = player.getServer().getPlayer(args[0]);
                targetPlayer.setHealth(20);
                return true;
            }

    }
    if(commandLabel.equalsIgnoreCase("diamondkit")){
        player.sendMessage("Diamond kid given!");
        player.setHealth(0);
        return true;
    }
        return false;





}

}