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javalong-integerbigdecimal

Is there a way to typecast a whole list of Big Decimals to list of Long values

If I have a List of BigDecimal objects, is it possible to typecast the whole list to a List of Long values without having to iterate over every BigDecimal object?

Solution

  • You will need to iterate one way or another. If you want to "hide" the iteration, you can use a stream:

    List<Long> longs = bigs.stream().map(BigDecimal::longValue).collect(Collectors.toList());

    But there will still be an iteration in the background.

    You mention that you don't want to iterate twice - you could save the stream of longs for later use:

    LongStream longs = bigs.stream().mapToLong(BigDecimal::longValue);

    And apply additional operations on that stream before collecting the results.