package com.baeldung.commons.beanutils; import java.util.HashMap; import java.util.List; import java.util.Map; public class CourseEntity { private String name; private List codes; private Map students = new HashMap(); public String getName() { return name; } public void setName(String name) { this.name = name; } public List getCodes() { return codes; } public void setCodes(List codes) { this.codes = codes; } public void setStudent(String id, Student student) { students.put(id, student); } public Student getStudent(String enrolledId) { return students.get(enrolledId); } }