if statement won't check through my array list - arrays

Question

I was trying not to resort to posting on the forums but everything I've done will not make this work. What I'm trying to do is if an ArrayList doesn't contain a players name then it will add them to the ArrayList, but it's skipping over that and just removing them from the list they were never added to. Ultimate goal out of this plugin is if they are in god mode they can't be hurt.
Command Class:
public static List<String> playerList = new ArrayList<String>();
#Override
public boolean onCommand(CommandSender sender, Command cmd, String str, String[] args) {
Player player = (Player) sender;
String p = player.getName();
List<String> isGod = new ArrayList<String>();
if (cmd.getName().equalsIgnoreCase("god") && sender instanceof Player) {
if (!isGod.contains(p)) {
isGod.add(p);
playerList.add(p);
player.sendMessage(ChatColor.GREEN + "Godmode is enabled");
return true;
} else {
isGod.remove(p);
playerList.remove(p);
player.sendMessage(ChatColor.GREEN + "Godmode is disabled");
return true;
}
}
return true;
}
}
Listener Class:
#EventHandler
public void isDamaged(EntityDamageEvent e) {
String player = e.getEntity().getName();
if (playerList.contains(player)) {
e.setCancelled(true);
}
}
}

Answer 1

As dly said yes, you create new empty list every time command is executed. You must init your list as global static in your class in order to make sure that this is only one list for all operations.
public static List<String> isGod = new ArrayList<>(); // <== HERE
public static List<String> playerList = new ArrayList<String>();
#Override
public boolean onCommand(CommandSender sender, Command cmd, String str, String[] args) {
Player player = (Player) sender;
String p = player.getName();
if (cmd.getName().equalsIgnoreCase("god") && sender instanceof Player) {
if (!isGod.contains(p)) {
isGod.add(p);
playerList.add(p);
player.sendMessage(ChatColor.GREEN + "Godmode is enabled");
return true;
} else {
isGod.remove(p);
playerList.remove(p);
player.sendMessage(ChatColor.GREEN + "Godmode is disabled");
return true;
}
}
return true;
}