Dynamically fill in an ArrayList with objects

Question

I have the abstract class Human, which is extendet by other two classes Student and Worker. I`m am trying to fill in two array lists. ArrayList of type Student and ArrayList of

Answer 1

Sure, just add the students:

ArrayList students = new ArrayList<>(); // note: students
students.add(new Student("Jens", "Nenov", "A+"));

You can do almost exactly the same thing for the workers. If you want to use a loop, do the following:

for (int i=0; i<50; i++) {
    students.add(new Student("Jens"+i, "Nenov", "A+"));
}

This will create a list of new students with different numbers after their names. If you want different data, though, that data needs to come from somewhere. For example, you might get the data from user input:

Scanner input = new Scanner(System.in);
for ...
    System.out.println("Enter a first name:");
    String firstname = input.nextLine();
    ...
    students.add(new Student(firstname, lastname, grade));