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Jon Skeet
Java 8 Streams: IntStream to String
In Java 8 streams API, calling chars() on any String object returns an IntStream object containing all the characters.
What would be the correct way to convert the returned IntStream object back to a String? Calling toArray() would give me an int[], which is not accepted by any of the String constructor.
You can use toArray(), then the String(int[], int, int) constructor. This isn't entirely satisfactory as chars() is specified to return UTF-16 code units, basically:
Returns a stream of int zero-extending the char values from this sequence. Any char which maps to a surrogate code point is passed through uninterpreted.
Using codePoints() instead would be more in-keeping with this constructor, which expects code points rather than UTF-16 code units. Otherwise (with chars) if your original string does contain surrogate pairs, you may find you get an error - I haven't tried it, but it would make sense.
I don't know of a simple way of doing this without converting to an array first.
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