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e01b: Handout for Practice Exam 'e01b'

ready?	date	points
true	Thu 07/07 09:30AM

CODE FOR QUESTION 1

/** Exercise based on p. 266 in HFJ, for H16, S12, CS56, UCSB, P. Conrad 
*/

public class Dog {

    private static Dog dogOfTheWeek = null;
    
    private String name;
    
    public void setAsDogOfTheWeek() {
	dogOfTheWeek = this;
    }

    public static Dog getDogOfTheWeek() {
	return dogOfTheWeek;
    }
    
    public Dog(String name) { this.name = name;}

    public static void main(String [] args) {

	Dog d1 = new Dog("Fido"); 
	Dog d2 = new Dog("Rover");
	Dog d3 = new Dog("Princess"); 
	Dog d4 = new Dog("Spot"); 
	Dog d5 = new Dog("Snoopy"); 


	d1.setAsDogOfTheWeek();    /*  1 */
	d1 = d2;                   /*  2 */
	Dog d6 = d3;               /*  3 */ 
	Dog temp = d4;             /*  4 */
	d4 = d3;                   /*  5 */
	d3 = temp;                 /*  6 */
	d2 = getDogOfTheWeek();    /*  7 */
	d4.setAsDogOfTheWeek();    /*  8 */
	d5 = null;                 /*  9 */
	d4 = null;                 /* 10 */
	d3 = null;                 /* 11 */
	d2 = null;                 /* 12 */
	d1 = null;                 /* 13 */
	temp = null;               /* 14 */
    }                              /* 15 */
}

Code for Question 2

Note: Line numbers are not part of the code. They are only there for reference.

Product.java

1	/** something that can be sold */
2	public abstract class Product {
3
4	/** get the price (in cents) */
5	public abstract int getPrice();
6
7	}

Shippable.java

1	/** something that can be shipped */
2	public interface Shippable {
3
4	/** get the shipping weight in pounds */
5	public double getWeight();
6	}

Book.java

1	/** A Book */
2	public class Book extends Product implements Shippable {
3
4	private int price;
5	private double weight;
6	private String author;
7	private String title;
8
9	public Book(String author, String title, int price,
10	double weight) {
11	this.author = author;
12	this.title = title;
13	this.price = price;
14	this.weight = weight;
15	}
16
17	public int getPrice() {return this.price;}
18	public String getTitle() {return this.title;}
19	public String getAuthor() {return this.author;}
20	public double getWeight() {return this.weight;}
21
22	}

Song.java

1	/** A downloadable Song */
2	public class Song extends Product {
3
4	private int price;
5	private String artist;
6	private String title;
7
8	public Song(String artist, String title, int price) {
9	this.artist = artist;
10	this.title = title;
11	this.price = price;
12	}
13
14	public Song(String artist, String title) {
15	this(artist,title,99);
16	}
17
18	public int getPrice() {return this.price;}
19	public String getTitle() {return this.title;}
20	public String getArtist() {return this.artist;}
21
22	}

End of Exam Handout