Help in adding values to particular vector in hasmap

Question

Hi there,
I have a question. I need to create a hashmap< Object, vector<Integers>> so that each object has vector of Integers associated with it. But I need to add the Integers to this hashmap in such a way that each Integer gets added to the vector of its particular Integer. For example,
From list of object { 1d, 3d, 4c, 7c, 8c, 9c, 2f, 10g, 11a, and so on}
Object c will have integers 4,7, 8, Object d will have integers 1,3,9, Object a will have 11 and so on. I will need to add the Integers to its respective hasmap vector at runtime. That is I need to create
<c, <4,7,8>> and <d, <1,3,9>> and so on.
Is there any way of doing that?
Thanks a lot,
priyanka

Answer 1

Use ArrayList instead of Vector. Vector is a deprecated class, and ArrayList is it's recommended replacement.
To store an int with it's associated Object:
Get the List value associated with the key Object
    If the List is null
        There's no List mapped to that Object yet, so create new List, add int to it, and put the Object and new List in the map.
    If the List is not null
        Add the int to the List