ListuniqueMStudentList = studentList.stream().collect( Collectors.collectingAndThen( Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(Student::name))), ArrayList::new) );
ListuniqueMStudentList = studentList.stream().collect( Collectors.collectingAndThen( Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(Student::name))), ArrayList::new) );
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