Transform a List<Object> to a Map such that the String is not a duplicate value using Java 8 Streams

Question

We have a Student class as follows:

class Student {
    private int marks;
    private String studentName;

    public int getMarks() {
        r         


        

Answer 1

An alternative solution is to use groupingBy with summingInt:

Map studentMap = studentList.stream()
        .collect(Collectors.groupingBy(
                s -> s.getStudentName().toLowerCase(),
                Collectors.summingInt(Student::getMarks)));