#1public class Classroom1 {
	private int roomNumber;

	public Classroom1(int aRoomNumber) {
		this.roomNumber = aRoomNumber;
	}

	public int getRoomNumber() {
		return roomNumber;
	}

	
#2public void printOn(PrintStream report) {
		report.println("I am Classroom: " + getRoomNumber());
	}
}

#1public class Professor1 {
	private String name;

	public Professor1(String aName) {
		this.name = aName;
	}

	public String getName() {
		return name;
	}

	
#2public void printOn(PrintStream report) {
		report.println("I am Professor: " + getName());
	}




}

public class College1 {
	private String name;
	
#1private List<Object> list;

	public College1(String aName) {
		super();
		this.name = aName;
		this.list = new ArrayList<>();
	}

	public void add(Object o) {
		this.list.add(o);
	}

	public void printFullReport(PrintStream report) {
		/*Compile error, "printOn not understood by Object
		for (Object each: this.list)
			
#2each.printOn(report);		//<---------- compile error here
		*/
		report.println("College: " + this.name);
		
#3report.println("Apologies, printing of list is not yet supported");
		report.println("Objects do not understand \"printOn\"");
	}

}