Intersection of Two Lists Objects in java 8

Question

An intersection of Two Lists Objects in java 8. Can some tell me what am I doing wrong?

List originalStudent = new ArrayList<>();
List&l         


        

Answer 1

What you can do is construct a SortedSet from the two concatenated lists originalStudent and newStudent. The sorted set uses a Comparator.comparing(Student::getName).thenComparing(Student::getLastName) as its comparator.

Stream.concat(originalStudent.stream(), newStudent.stream())
    .collect(Collectors.toCollection(() -> new TreeSet<>(
        Comparator.comparing(Student::getFname)
            .thenComparing(Student::getLname))
    ))