Is it possible to have a hashmap with 4 objects?

Question

Can I have an hashMap with say ID as my key and info, name, quantity as my values?

ok, say I have a class (Products) already that sets my variables, getters and setters. In my Invoice class, which is where the hashMap would be. Would I put like:

private HashMap<String, Products> keys = new HashMap<String, Products>

I'm not quite sure how to access the HashMap though. Say I implement a class that allows me to add and remove invoices from the HashMap, I do not know what the values would be:

keys.put(??value of id??,??not sure what goes here??);

Answer 1

Sure. Make another class that contains your info, name and quantity and put that as the value of your HashMap.

Answer 2

No, but the best way is to wrap the information you want to keep in the map in a class:

public class Info {
  private String info;
  private String name;
  private int quantity;

  ...

  public Info(String info, String name, int quantity) {
     ...
  }
}

Then do this to put something in the map:

Info info = new Info("info", "name", 2);
Map map = new HashMap<Integer, Info>();
map.put(22, info);

And do this to get something out:

Info info = map.get(22)

Answer 3

How about HashMap<Integer, ArrayList<String>> ?

UPDATE: Please try to avoid this, this is a better approach.