/* Hello, I'm Classroom2, a minimal model of a classroom. * I only am different than Classroom1 in one way, * I implement the Printable interface */ import java.io.PrintStream; public class Classroom2 implements Printable { private int roomNumber; public Classroom2(int aRoomNumber) { this.roomNumber = aRoomNumber; } public int getRoomNumber() { return roomNumber; } public void printOn(PrintStream report) { report.println("I am Classroom: " + getRoomNumber()); } }