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Answers to Questions and Exercises: Creating Classes

Questions

Question 1: Consider the following class:

public class IdentifyMyParts {
    public static int x = 7; 
    public int y = 3; 
}

a. How many class variables does the IdentifyMyParts class contain? What are their names?
Answer 1a: 1, x

b. How many instance variables does the IdentifyMyParts class contain? What are their names?
Answer 1b: 1, y

c. What is the output from the following code:

IdentifyMyParts a = new IdentifyMyParts();
IdentifyMyParts b = new IdentifyMyParts();
a.y = 5;
b.y = 6;
a.x = 1;
b.x = 2;
System.out.println("a.y = " + a.y);
System.out.println("b.y = " + b.y);
System.out.println("a.x = " + a.x);
System.out.println("b.x = " + b.x);

Answer 1c: Here is the output:

 a.y = 5 
 b.y = 6 
 a.x = 2 
 b.x = 2

Exercises

Exercise 1: Write a class whose instances represent a playing card from a deck of cards.
Answer 1: Card.java

Exercise 2: Write a class whose instances represents a deck of cards.
Answer 2: See Deck.java.

Exercise 3: Write a small program to test your deck and card classes. The program can be as simple as creating a deck of cards and displaying its cards.
Answer 3: See DisplayDeck.java.

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