Representing in a collection

[Dalia Sultana]

I have some data in a flat file like the following :

date1 date2 date3

id1 10 12 13
id2 11 12 9
id3 7 9 4

I need to store this in a way so that a value can be easily retrieved by calling something like get(id1,date3), which should return 13.

I am currently thinking off something like this
Hashmap<int, HashMap<Date, value>>

But just wondering if there is an easier/better approach to do this?

[Kudret Serin]

You can define your own "data type".
For example:

   class myData{
 
    private int id;
    private String date1;
    private String date2;
    ....
 
    public int getId(){
         return this.id;
    }
    public void getId(int id){
         this.id=id;
    }
    ...
    // getter and setter methods for all fields.
} 

You can also provide a constructor with parameters to set the fields while instantiating an object.