what is the best way to maintain a list of Transactions in java (transaction object having fields like id, date, amount etc)

Question

What is the best way to maintain a list of Transactions (transaction object having fields like id, date, amount etc) so that i can fetch results based on different criteria like

• last 10 transactions
• transaction between 2 dates
• transactions by year
• etc..

Answer 1

You can use the Java 8 Stream API.

Say transactions is a List<Transaction> , you can use, for example:

List<Transaction> validTrxs = transactions.stream()
                               .filter( (Transaction tr) -> tr.isValid() )
                               .collect( Collectors.toList() );

(Instead of tr.isValid() you could put practically any condition you can make into a boolean expression)