use of removeif for filtering list containing objects

Question

I am stuck on using removeif java 8 and looking for some help

List<ACHTransaction> transactions = transactionDao.retrieveTransactions(getJobParameters();

from transactions I want to remove those transactions based on checking property of object

if transaction.getFileHash is not null then I want to remove that transaction. if transaction.getFileHash is null I want to keep it.

so I am trying removeif

List<ACHTransaction> transactions = transactionDao.retrieveTransactions(getJobParameters().removeIf(t -> (Optional.ofNullable(t.getFileHash()).orElse(0).intValue() != 0));

but I am getting errors. Is someone can explain how removeif work with object properties?

Answer 1

You can retrieve the list and then remove the elements with removeIf:

List<ACHTransaction> transactions =
    transactionDao.retrieveTransactions(getJobParameters());

transactions.removeIf(t -> t.getFileHash() != null);

Or you can do as in your own answer and use a stream:

List<ACHTransaction> transactions =
    transactionDao.retrieveTransactions(getJobParameters()).stream()
        .filter(t -> t.getFileHash() == null)
        .collect(Collectors.toList());