Section 17.5.2 Filtering Strings Then Sorting Them in Case-Insensitive Ascending Order
• Stream method sorted (p. 748) can receive a Comparator as an argument to specify how to compare stream elements for sorting.
• By default, method sorted uses the natural order for the stream’s element type.
• For Strings, the natural order is case sensitive, which means that "Z" is less than "a". Passing the predefined Comparator String.CASE_INSENSITIVE_ORDER performs a case-insensitive sort.
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