How can I put a cooldown on commands/messages

Trying to reduce spam, how can I put something like a 1 second cool down in between saying commands and messages?

 

You'll have to keep track of the time when the player last send a command, and then cancel it if it was too soon ago.

 

How would I do this?

 

Create a HashMap of Strings (player names) and longs (timestamps). Each time a message is chatted, do the following:

1. Check if the player is in the map: map.containsKey(player.getName())
2. If they are, check if the number is more than X seconds before the last message time: ((System.currentTimeMillis()/1000) -map.get(player.getName())) < minimumTimeBetweenMessages
3. If it was, then cancel the event: event.setCancelled(true)
4. Then set the current time in the map so you know when their last message was: map.put(player.getName(), (long)(System.currentTimeMillis()/1000))

 

Code:

private HashMap<String, Date> cooldowns = new HashMap<String, Date>();
 
@Override
public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {
    if(cooldowns.containsKey(sender.getName())&&cooldowns.get(sender.getName()).getTime()>new Date().getTime()) {
        sender.sendMessage("You must wait a bit before using this command again.");
        return true;
    }
    if(!(sender instanceof Player)) {
        cooldowns.put(sender.getName(), new Date(new Date().getTime() + 60000))); // Replace 60000 with the cooldown time you want in miliseconds
    }
    // Do your command stuff here
}