How to convert multiple attributes of object into List using java 8

Question

I am wondering if there is a way to combine multiple attributes from an object into a list of String. In My Case, I have an object with the name "debitCardVO" and I want it to convert from object to List

Here is my code Snippet:

for (DebitCardVO debitCardVO : debitCardVOList) {
    List<String> debitCardList   = debitCardVOList.stream()
            .map(DebitCardVO::getCardBranchCode,DebitCardVO::getAccountNo)
            .collect(Collectors.toList());
}

What's the use case for that? Assuming all those attributes can be converted to strings what would you do with that? If it's for serialization why not use Json or some other string representation? — Thomas, Feb 07 '19 at 11:54

score 7 · Accepted Answer · edited Feb 07 '19 at 11:58

7

flatMap can help you flatMap vs map

List<String> debitCardList = debitCardVOList.stream()
                    .flatMap(d -> Stream.of(d.getCardBranchCode(),d.getAccountNo()))
                    .collect(Collectors.toList());

Other examples here

edited Feb 07 '19 at 11:58

Naman

27,789
26
218
353

answered Feb 07 '19 at 11:54

David Pérez Cabrera

4,960
2
23
37

2

Indeed the first thing that came to my mind as well. +1 – Naman Feb 07 '19 at 11:57

How to convert multiple attributes of object into List using java 8

1 Answers1