Convert list into String with values

Question

I use this code to return a list from REST endpoint:

private String getCurrencies(Integer id) {      
    List<CurrencyDTO> list = null;
    try {
        list = StreamSupport.stream(currenciesService.getCurrencyByContractID(Integer.valueOf(id)).spliterator(), false)
                   .map(currencies_mapper::toDTO)
                   .collect(Collectors.toList());
    } catch (Exception e) {
        e.printStackTrace();
    }

    return list.toString();
}

DTO:

public class CurrencyDTO {

    private Integer id;

    private Integer contract_id;

    private String code;
    ...
}

How I can get a list of values from code values? Something like that:

String list = "code, code, code, code, code";

https://stackoverflow.com/questions/1751844/java-convert-liststring-to-a-string — UninformedUser, May 08 '19 at 17:58

score 2 · Answer 1 · answered May 08 '19 at 18:06

2

If you implement toString() of CurrencyDTO to simply return the code, then list.toString() will return [code, code, code, code, code]

Otherwise use streams:

list.stream().map(CurrencyDTO::getCode).collect(Collectors.join(", "))

answered May 08 '19 at 18:06

Andreas

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Convert list into String with values

1 Answers1