Changer les dégâts de chute

package fr.src.falldamages;

import org.bukkit.Bukkit;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.EntityDamageEvent;
import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin implements Listener{

    public void onEnable()
    {
        PluginManager pm = Bukkit.getServer().getPluginManager();
        pm.registerEvents(this, this);
    }

    public void onDisable()
    {

    }

    public double Randomizer(double min, double max)
    {
        double calculus = (Math.random() * (max - min));
        return calculus;
    }

    @EventHandler
    public void FallDamages(EntityDamageEvent e)
    {
        if(!(e.getEntity() instanceof Player))
        {
            return;
        }

        Player p = (Player) e.getEntity();
        if(e.getCause() == DamageCause.FALL)
        {
            p.damage(Randomizer(2.0D, 20.0D));
        }

    }

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args)
    {
    //  Player p = (Player) sender;




        return true;
    }

}