Time online

Hi, I am currently coding a Bukkit plugin and need to see how long the user has been logged onto the server for, for example if someone stays on the server for a certain amount of time this will happen... So, basically I need the time that they have been on the server for.

Thanks

 

That session time of the player.

 

@harhar4932843098234

1. Create a Map storing a value related to the player (UUID or Name) as the key, and a Long which will be when the player joined in milliseconds.
2. Create a RepeatingTask. Inside this task, loop through every player online and see if the Current-Time-in-Milliseconds - Milliseconds in the map is greater than the amount of time you want to check for.
   
3. If so, re-add the current milliseconds to the map. This will allow for you to have these checks multiple times per session. If you do not want this to happen multiple time per session, then remove the player from the Map.
4. You can set the delay for this for however long you want. If you need it to be precise, then set it to repeat every second, else you can wait minutes before repeating to save memory.

 

How would I go about getting the system time to add to my hashmap?

 

@harhar4932843098234
System.currentTimeMillis returns a long which is the current time in milliseconds.

 

This does not seem to be working, please help. (No hate, I only started coding Java yesterday and this is all mine.)

Code:

    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e) {
        final HashMap<UUID, Long> hashmap = new HashMap<UUID, Long>();
        Player player = e.getPlayer();
        //Date now = new Date();
        hashmap.put(player.getUniqueId(), System.currentTimeMillis());
        //Added systime and UUID to hashmap
       
        if ((System.currentTimeMillis() - hashmap.get(System.currentTimeMillis())) == 60000) {
            //Run get key code
            player.sendMessage(ChatColor.BLUE + "You have been on the server long enough to earn yourself a key!");
        } else {
            player.sendMessage(ChatColor.RED + "False.");
        }
               
    }

 

And this is your problem. Fully understanding Java is a requirement for making Bukkit plugins, as not knowing Java allows you to make mistakes and almost always leads to confusion. Please learn Java before working on Java.

If you do not have a Java tutorial already, you should select one from the following link. Stick with this for a few weeks until you got a good understanding of Java and it's classes and methods.
https://bukkit.org/threads/plugin-dev-sticky-learning-java-where-to-learn.395662/

 

Thank you. Honestly.

Which one would you recommend?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

@harhar4932843098234
I would recommend the official tutorials provided by oracle. Here's the link:
https://docs.oracle.com/javase/tutorial/

 

Thank you, I have been working through them and I am beginning to understand the key concepts.