Java 8 remove duplicate strings irrespective of case from a list

pps :

How can we remove duplicate elements from a list of String without considering the case for each word, for example consider below code snippet

    String str = "Kobe Is is The the best player In in Basketball basketball game .";
    List<String> list = Arrays.asList(str.split("\\s"));
    list.stream().distinct().forEach(s -> System.out.print(s+" "));

This still gives the same output as below, which is obvious

Kobe Is is The the best player In in Basketball basketball game .

I need the result as follows

Kobe Is The best player In Basketball game .

Holger :

Taking your question literally, to “remove duplicate strings irrespective of case from a list”, you may use

// just for constructing a sample list
String str = "Kobe Is is The the best player In in Basketball basketball game .";
List<String> list = new ArrayList<>(Arrays.asList(str.split("\\s")));

// the actual operation
TreeSet<String> seen = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
list.removeIf(s -> !seen.add(s));

// just for debugging
System.out.println(String.join(" ", list));