MBedwars: Example for creating custom stats

class LevelStatSet implements PlayerStatSet {

    @Override
    public String getId(){
        return "leveladdon:level";
    }

    @Override
    public Plugin getPlugin(){
        return myPlugin;
    }

    @Override
    public String getName(@Nullable CommandSender sender){
        return Message.buildByKey("LevelAddon_Stat_Level", "Level").done(sender); // will try to obtain it from the messages file or display "Level" by default
    }

    @Override
    public String getDisplayedValue(PlayerStats stats){
        return Helper.get().formatNumber(getValue(stats)); // how it will be displayed in /bw stats
    }

    @Override
    public Number getValue(PlayerStats stats){
        return return stats.get("leveladdon:exp").longValue() / 1000L; // your fomular to convert exp -> level
    }
}

class ExpStatSet implements PlayerStatSet {

    @Override
    public String getId(){
        return "leveladdon:experience";
    }

    @Override
    public Plugin getPlugin(){
        return myPlugin;
    }

    @Override
    public String getName(@Nullable CommandSender sender){
        return Message.buildByKey("LevelAddon_Stat_Experience", "Experience").done(sender); // will try to obtain it from the messages file or display "Experience" by default
    }

    @Override
    public String getDisplayedValue(PlayerStats stats){
        return Helper.get().formatNumber(getValue(stats).longValue()); // how it will be displayed in /bw stats
    }

    @Override
    public Number getValue(PlayerStats stats){
        return return stats.get("leveladdon:exp").longValue();
    }

    @Override
    public void setValue(PlayerStats stats, Number num){
        stats.set("leveladdon:exp", num);
    }
}

StatSet expSet = new ExpStatSet();
StatSet lvlSet = new LevelStatSet();

PlayerDataAPI.get().registerStatSet(expSet);
PlayerDataAPI.get().registerStatSet(lvlSet);

PlayerDataAPI.getStats(player, stats -> {
    expSet.setValue(player, 12489);

    player.sendMessage("Your exp: " + expSet.getValue(player) + ", your lvl: " + lvlSet.getValue(player));
});