Question

I have a class Player

public Player (String name, int num) {
    name = name;
    num= num;
}

//getters and Setters

then I will have a list of players

List<Player> listPlayers = new ArrayList<Player>(); 

I need to make a method to return the player name given the number

String getPlayerName(int num){
    ...
}

I can make the method seeing all the list but I want to do this in a more efficient way.
Can someone give me some tips?

Thanks for the help.

Answer 1

Use a Map<Integer, Player> to store all players. Fetching a player from a map by his num will be very efficent:

map.get(num);