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# Calculate total from list of lists and map to pojo

Greenhorn
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Hello,

I need to process my array list and calculate the total that is take from each account balance.
I can't have another data structure as per homework.

POJO's

First though was to loop over the list and

This does not work as the previous total is added to the next customer.

A potential solution would be to add an accountKey to the Customer and Account, so I can have a constant in both lists, to check if they match and calculate the total.
Maybe that would stop the addition of balance to the next customer.
I don't think that is a go, tho.

Saloon Keeper
Posts: 9343
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What does it mean for an Account to have a total? Doesn't the balance represent the total? It seems like what you are looking for is a Customer total which is a total of all of the balances in all the accounts that the  customer has.

Craig Star
Greenhorn
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thank you, I understand now where I was wrong.
A customer is one and accounts are many.
Still, if I would have wanted to have a variable in each account, as "totalForAllAcounts", how would that be achievable?

customer: details
Account: details of the account + new field totalOfAllAccounts

I can solve the sew field in the customer.

Rancher
Posts: 4801
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Why would each Account have a total for all accounts?
That doesn't make much sense.

Craig Star
Greenhorn
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After some thought I understand.
If in any case there should be such a requirement, it would point a reference to the total in the Customer pojo

 Consider Paul's rocket mass heater.