How to check if a player has done this?

I'm wondering how i can check to see if a player has typed a certain command since they logged on.

I need like a counter also to make sure they can only use this command one time when they log on.

Also how i can block them from using that command until they re log and it resets like a counter.

 

Code:java

public static ArrayList<String> usedCommand = new ArrayList<String>();
 
//in onCommand
if (sender instanceof Player) {
Player p = (Player) sender;
if (commandLabel.equalsIgnoreCase("Command") && !usedCommand.contains(p.getName()) {
//do stuff
usedCommand.add(p.getName());
}
}
 
// Listener
 
@EventHandler
public void onPlayerQuit(PlayerQuitEvent e) { //or login event, they would need to relog either way
if (usedCommand.contains(e.getPlayer().getName()) usedCommand.remove(e.getPlayer().getName());
}

Tahg me if you don't understand any of this ^

 

Use a hashset instead of an arraylist here for better performance.