Storing player values

So im making a replica of Jerry and Harry's AgarPvp and I need to know how to store player values and then change then if the player is punched/killed/kills someone. i have no idea how hashmaps work but is that my only option?

 

There's a bunch of ways you can do it.

Why don't you look at what that other plugin does? Because I sure don't know what it does

 

that plugin is on a private server and there is no way to access it. I want to re-create it because most of the perks in that game are donator only so the donators get a huge advantage. Plus i wanted to make a plugin.

 

Well generally it helps us help you if we know what you're talking about.
Wanna explain to us what it does?

 

you go around killing animals to gain mass which is a player variable that i don't know how to store then you can kill people to gain all of their mass or they can kill you to gain your mass. Basically i need a variable that stores a person's mass that can be easily be reset automatically when the player dies. so im guessing it would be something like this:

Code:

@EventHandler
    public void OnPlayerDeath(PlayerDeathEvent e) {
    Player p = e.getEntity();
    Player k = p.getKiller();

    //insert variable creation here that is called mass

    k.mass = k.mass p.mass
    p.teleport(x, y, z)
    k.sendMessage(ChatColor.GREEN + "You killed " + p.getName() + " For " ChatColor.BLUE + p.mass + ChatColor.GREEN + " mass!")

}

sorry if that's a bit confusing i hope that helped

EDIT: i tried HashMaps but got very confused by the tutorials and they only showed boolean values for them

Also the variable would have to be able to be put on the sidebar scoreboard

 

Booleans are the single least useful thing to use HashMaps for, what tutorial were you watching?

You're not checking if the player even has a killer, let alone if it's another player in your event, you're gonna get a lot of errors.
Also, what is:
k.mass = k.mass p.mass
What are you trying to achieve with that?

HashMaps are easy to learn, it's just a value stored with a Key to reference it.
Store the Player's UUID as a Key, and their "mass" as the value.

HashMap#put(p.getUniqueId(), mass);

Look, if you don't understand Java, you shouldn't be making a plugin.
Submit a plugin request instead

 

I meant to put k.mass = k.mass + p.mass because i want the player to gain the person that they kill

 

Cool, let us know how it goes