Drawer

package net.maciekmm;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;

public class Drawer {

    public enum Clazz {

        GEO, HISTORY, SOCIETY
    }

    private static final ArrayList<Student> students = new ArrayList<>(30);
    
    public static void main(String[] args) {
        
        //Load students
        
        new Drawer(Clazz.GEO, 2, 50).draw();
        new Drawer(Clazz.HISTORY, 1, 50).draw();
        new Drawer(Clazz.SOCIETY, 1, 50).draw();
    }

    private final int lessons;
    private final int studentsPerLesson;
    private final Clazz clazz;

    public Drawer(Clazz clazz, int studentsPerLesson, int lessons) {
        this.studentsPerLesson = studentsPerLesson;
        this.lessons = lessons;
        this.clazz = clazz;
    }

    public void draw() {
        System.out.println("Starting draw for " + clazz);
        Collections.shuffle(students);
        int studs = 0;
        for (int lesson = 0; lesson < lessons; lesson++) {
            System.out.println("Lesson: " + (lesson + 1));
            int drew = 0;
            while (drew != studentsPerLesson) {
                Student student = students.get(studs);
                if (!student.hasBeenQuestioned(clazz)) {
                    drew++;
                    System.out.println("    " + student.getId());
                }
                studs++;
                if (studs + 1 == students.size()) {
                    flipQuestionedStatus();
                    break;
                }
            }
        }
    }

    private void flipQuestionedStatus() {
        Collections.shuffle(students);
        for (Student student : students) {
            student.setQuestioned(clazz, !student.hasBeenQuestioned(clazz));
        }
    }

    public static class Student {

        private final String id;
        private HashMap<Clazz, Boolean> questioned = new HashMap<>();

        public Student(String id) {
            this.id = id;
        }

        public String getId() {
            return id;
        }

        public void setQuestioned(Clazz clazz, boolean questioned) {
            this.questioned.put(clazz, questioned);
        }

        public boolean hasBeenQuestioned(Clazz clazz) {
            return this.questioned.get(clazz);
        }

    }
}