Homework #2

You must submit your work to your instructor before midnight on due date. Failure to do so will result in late penalties, see the syllabus for grading detail.

Problem 1 (20 points)

Draw a conceptual UML class diagram for the classes WebMailSystem, Email, User, Folder, Attachment, Mailbox, and their semantic relationships and cardinalities. These classes are part of a project that models a web-based email system.

Problem 2 (20 points)

Given the following UML write the corresponding Java code.

Problem 3 (20 points)

Given the following Java code, draw the corresponding UML class diagram. Include as much information as possible in the UML class diagram.

public interface Device {
	public void setPower(double power);
}

public class Speaker {
	int volume = 1;
	public void setVolume(int volume) {
		this.volume = volume;
	}
	public String toString() {
		return "Volume: " + volume;
	}
}

public class TV {
	protected Speaker[] speaker;	
	public TV() {
		speaker = new Speaker[2];
		speaker[0] = new Speaker();
		speaker[1] = new Speaker();
	}
	public Speaker getSpeaker(int number) {
		return speaker[number-1];
	}
}

public class HDTV extends TV implements Device {
	private double power;	
	public HDTV() {
		speaker[0].setVolume(8);
		speaker[1].setVolume(32);
		power = 128;
	}
	public void setPower(double power) {
		this.power = power;
	}
	public String toString() {
		String res = speaker[0] + " " + speaker[1];
		return (res + " Power: " + power);
	}
} 

Important: Don't forget to re-read the syllabus to make sure you understand all the deliverables for assignments in this class, including this one.