package advanced; public class Teacher { private String id; private String name; private java.util.List classes; public Teacher() { this.classes = new java.util.ArrayList<>(); } public Teacher(String id, String name) { this.id = id; this.name = name; this.classes = new java.util.ArrayList<>(); } public void addClass(ClassRoom classRoom) { classes.add(classRoom); } public void removeClass(ClassRoom classRoom) { classes.remove(classRoom); } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public java.util.List getClasses() { return classes; } public void setClasses(java.util.List classes) { this.classes = classes; } }