Solved Save and Get data.

The point of this plugin is to save a block broken count of each player inside a file.
And then use it later


So I have this class:

Spoiler: User Class

Code (Java):

public final class User{

    private UUID uuid;
    private String name;
    private int blockCount;

    public User(UUID uuid, String name, int blockCount){
        this.name =  name;
        this.uuid = uuid;
        this.blockCount = blockCount;
    }

    public UUID getUuid() {
        return uuid;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public int getBlockCount() {
        return blockCount;
    }

    public void setBlockCount(int blockCount) {
        this.blockCount = blockCount;
    }

    public void sendMessage(final String message){
        Objects.requireNonNull(Bukkit.getPlayer(uuid)).sendMessage(ChatColor.translateAlternateColorCodes('&', message));
    }

And the user handler class

Spoiler: User Handler Class

Code (Java):

public class UserHandler {

    public HashMap<UUID, User> users = new HashMap<>();
    private final RevBlocks plugin;

    public UserHandler(RevBlocks plugin){
        this.plugin = plugin;
    }

    public void register(final UUID uuid, String name, final int blocks){
        users.put(uuid, new User(uuid, name, blocks));
    }

    public boolean exists(final UUID uuid){
        return users.containsKey(uuid);}

    public HashMap<UUID, User> getUsersMap(){
        return users;
    }

    public User findUser(UUID uuid){
        return users.get(uuid);}

When a player joins I register the player to the hashmap.

Code (Java):

if (!userHandler.exists(uuid)) {
                userHandler.register(uuid, player.getName(), 1);

Then to count the blocks broken I do this:

Spoiler: BlockBreakEvent

Code (Java):

        @EventHandler
        public void onBlockBreak(final BlockBreakEvent event){

            // Get the player and the block broken.
            final Player player = event.getPlayer();
            final Block block = event.getBlock();

            // Get the user by UUID.
            final User user = userHandler.findUser(player.getUniqueId());

            // Increment the user's blocks broken.
            user.setBlockCount(user.getBlockCount() + 1);
            user.sendMessage("&bBlocks Broken: " + user.getName() + user.getBlockCount());

        }

Now this is where I am stuck
Could please someone guide me on how I should save the data to a file that is inside the Hashmap (HashMap<UUID,User>)

And then get the data from a file, and use it after server reset so the data won't reset and the block count will keep going.

 

Hey! Thank you for the reply! That's what I do
since this is how I save the data:

Code (Java):

        // Loop through the map.
        for (UUID uuid : userHandler.getUsersMap().keySet()){

            // Get the user.
            User user = userHandler.findUser(uuid);

            String name = user.getName(); // User's name.
            int blockCount = user.getBlockCount(); // User's block count.

            // Save the data.
            cs.set(name + ".uuid", user.getUuid().toString());
            cs.set(name + ".blockCount", blockCount);

            // Save the config and debug.
            plugin.saveConfig();
            Bukkit.broadcastMessage("Task saved, saved users");

It works very well,
But when the server reset, the hashmap is empty, how do I populate the hashmap, and where exactly? Because the information is stored using a hashmap.
user.setBlockCount(user.getBlockCount() + 1);

 

Hey!
The video helped me a lot!
But I am still stuck.

This is how save the data which works perfectly.

Code (Java):

    @Override
    public void onDisable() {
        if (!userHandler.getUsersMap().isEmpty()) {
            for (Map.Entry<UUID, User> entry : userHandler.getUsersMap().entrySet()) {
                this.getConfig().set("data." + entry.getKey().toString(), entry.getValue());
            }
            this.saveConfig();
        }
    }

The problem is the populate hashmap which throws me errors.

Code (Java):

   
public void restoreData(){

    ConfigurationSection dataSection = this.getConfig().getConfigurationSection("data"); // Access the data:

    if (dataSection == null) return; // Null check

    // Loop through all the keys under data:
    for (String key : dataSection.getKeys(false)) {
        ConfigurationSection uniqueData = dataSection.getConfigurationSection(key);

        UUID uuid = UUID.fromString(uniqueData.getString(key)); // Each key is a uuid
        String name = uniqueData.getString("name");
        int blockCount = uniqueData.getInt("blockCount");

        User user = new User(uuid, name, blockCount);
        userHandler.getUsersMap().put(uuid, user);

    }
        }

How its in the config:

Code (YAML):

data:
  de4b97ab-b9be-4c4a-8778-f9643d2a13: !!me.hyperburger.revblocks.user.User
    blockCount: 20
    name: HyperBurger
 

THE PROBLEM;
Whenever I "populate" the hashmap it throws errors and doesn't work.

 

Hey! I solved the problem.

I need to use this:
UUID uuid = UUID.fromString(key);

Instead of UUID uuid = UUID.fromString(uniqueData.getString(key));

Works like a charm.
Thanks everyone for the help,thread solved.