Collections - Search by value

[Java Maverick]

Hi

I have this requirement

SSN Number                Bank A/c Numbers
 
E885344                               SAV_A/C_1,                 SAV_A/C_2,                  SAV_A/C_3
E892323                               A/C_1443                     A/C_567
F234232                               A/C_NUM_10,                A/C_34232                    A/C_1231231

A person can have one SSN number and anynumber of back accounts.

When a bank A/c number[which is unique] is given as input i shold get back the SSN number

Any data struture in JAVA for this.


Regards,
Venkat

[David Newton]

So you want to map from an account number to an object?

[Janeice DelVecchio]

I might use a Map. The key would be the Bank Account Number, the value would be the SSN.

[Venu Chakravorty]

Hi David and Janeice,
Is it to be done like this:
Map<String, ArrayList<String>> acc = new Hashtable<String, ArrayList<String>>;

[Sridhar Santhanakrishnan]

I had a similar problem sometime back and found BidiMap from Apache Commons. However, you might have to add the same SSN multiple times for each bank account.

[Janeice DelVecchio]

I would create a map like this:

 Map<String, String> accounts = new HashMap<String, String>;   

The first String is the account number. That is because the account number is unique. The second String will be the SSN. That is because each account number has one and only one SSN, but there can be more than one account associated with each SSN. The API for Map provides lots of ways of searching by value or by key, so you will be able to output in many ways.