Fly

package com.immortal.core;

import java.util.ArrayList;
import java.util.List;

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

import net.md_5.bungee.api.ChatColor;

public class Fly extends JavaPlugin
{
    List<Player> fly = new ArrayList<>();

    @Override
    public void onEnable()
    {
        System.out.println("Fly Plugin Has Been Enabled");
    }

    @Override
    public void onDisable()
    {
        System.out.println("Fly Plugin Has Been Disabled");
    }

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args)
    {
        if (sender instanceof Player)
        {
            Player player = (Player) sender;

            if(args.length >= 0)
            {
                player.sendMessage(ChatColor.RED + "Don't specify any arguements");
            	return true;
            }

            if(cmd.getName().equalsIgnoreCase("fly"))
            {
                if(fly.contains(player))
                {
                    fly.remove(player);

                    player.setAllowFlight(false);

                    player.sendMessage(ChatColor.DARK_GREEN + "You have disabled fly!");
                } else
                {
                    fly.add(player);

                    player.setAllowFlight(true);

                    player.sendMessage(ChatColor.DARK_GREEN + "You have enabled fly");
                }
            }
        }
        return true;
    }
}