При помощи Сканера удалить элементы Set [дубликат]

Замените

if (next.getName() == fromUser) {

на

if (next.getName().equals(fromUser)) {

class Student {
    private String name;
    Student(String name, int age, String sex, double weight) {
        this.name = name;
        // ...
    }
    String getName() {
        return this.name;
    }
    @Override
    public String toString() {
        return String.format("Student <'%s'>", name);
    }
}
// ...
public static void main(String[] args) {
    Set<Student> students = new HashSet<>();
    students.add(new Student("Anton", 33, "Male", 88.3));
    students.add(new Student("Ira", 21, "Female", 38.3));
    students.add(new Student("Petro", 27, "Male", 46.3));
    Scanner scan = new Scanner(System.in);
    System.out.print("Enter who: ");
    String fromUser = scan.next();
    Iterator<Student> iterator = students.iterator();
    while (iterator.hasNext()) {
        Student next = iterator.next();
        if (next.getName().equals(fromUser)) {
            iterator.remove();
        }
    }
    for (Student student : students) {
        System.out.println(student);
    }
}

Консоль:

Enter who: Ira
Student <'Anton'>
Student <'Petro'>

PS.

Начиная с java 8, цикл с итератором можно заменить на эту конструкцию:

students.removeIf(next -> next.getName().equals(fromUser));