I am attempting to convert a 2D int array into a 2D String array with this code:
Arrays.stream(intArray).map(a ->
Arrays.stream(a).map(i ->
Integer.toString(i)).toArray()).toArray(String[][]::new);
but I get the compile-time error cannot convert from String to int when doing Integer.toString(i). I thought it could be because I'm collecting the results of streaming an int array in a String array, but doesn't map create a new Collection?
Arrays.stream on an int[] returns an IntStream, and to go from an int to a String or any other Object, you have to use the IntStream.mapToObj method, not the map method:
Arrays.stream(intArray).map(a ->
Arrays.stream(a).mapToObj(i ->
Integer.toString(i)).toArray(String[]::new)).toArray(String[][]::new);
The map method of IntStream is only used to map from an int to an int.
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