How to save two values in one system?

Hi,
I want to save a player and a location in one data system. But an array for example can only save one value. HashMap etc. doesn't work, because I don't know the players and so I don't have any key. Is there a system like an array, which can be read out completely without knowing something about the content? With index ids or something?

Thanks.

 

Why don't you know the players?

 

Well, you could create a holder class, with a player and a location, and do a list of this holder class:
List<Holder> list;
h = list.get(1);
h.getPlayer();
h.getLocation();

 

How can you add something if you don't know what to add?

 

I get all Players standing in an area and save them to a HashMap for example. But I can't read it using for and index, I can only get values for specific keys. I could save the player names in a second system, but I want to have only one.

 

Why can't you read it using for and index? o-o

 

Code:java

private HashMap<String, Location> playerLocations = new HashMap<String, Location>();
 
public void putPlayer(Player player) {
    if (player == null)
        return;
 
    playerLocations.put(player.getName(), player.getLocation());
}
 
public Location[] giefPlayerLocations() {
    return playerLocations.values().toArray();
}
 
public void iterateOverMap() {
    for (String playerName : playerLocations.keySet()) {
        //do stuff
    }
}

 

Works now, thanks!

 

Depending if you want to get Key and Values but not edit them you could also use this one:

Code:java

for (Map.Entry<K,V> entries : map.entrySet()) {
     entries.getKey(); // Gets the Key
     entries.getValue(); // Gets the Value bound to the Key
}

K,V are the Object classes used, eg String and Location, map is the Map (eg HashMap) you use