Java 8 : Comma separated string to Generic List using Stream.of()

Question

I need a common static function for convert comma separated string to a generic list.

String str = "1,2,4,5";
List<BigInteger> lists = Stream.of(str.split(",")).map(String::trim).map(BigInteger::new).collect(Collectors.toList());

Instead of this .map(BigInteger::new) I need a generic expression to convert to generic list

Sounds like you need a Function<String, T> to convert a string to your generic type. — khelwood
– khelwood, Commented Sep 22, 2020 at 8:56

khelwood · Accepted Answer · 2020-09-22 09:02:12Z

4

The BigInteger::new step executes a Function<String, BigInteger> to convert each string to an instance of BigInteger. If you want to do this for a generic type, you need a function to convert a string to an instance of your generic type. That means you need a Function<String, T>.

Given Function<String, T> converter, you can do:

List<T> items = Stream.of(str.split(","))
                      .map(String::trim)
                      .map(converter)
                      .collect(Collectors.toList());

answered Sep 22, 2020 at 9:02

khelwood

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