converting List type with Lambda Java

Question

If I have an expression:

  / List<Long> /                   / List<String> /
s.getPhones().addAll(Arrays.asList(rs.getString("phones").split(",")));

Can I use Java Lambda to convert types with Long.parseLong in pritty form without "for loop" ? Or even if will use for loop, it will became more "codeless".

How it must look like?

rgettman · Accepted Answer · 2015-06-16 21:06:38Z

2

You can convert the List<String> to a Stream, map the elements to Long, then collect them back to a List<Double> that is suitable to pass to addAll on s.getPhones(). No lambda expression is necessary because of the method reference, but streams makes this easier.

s.getPhones().addAll(
    Arrays.asList("123,456,789".split(","))
        .stream()
        .map(Long::valueOf)  // You could use: (s -> Long.valueOf(s))
        .collect(Collectors.toList()));

answered Jun 16, 2015 at 21:06

rgettman

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