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Questions and Exercises: Classes

Questions

1. Consider the following class:

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

   1. What are the class variables?

   2. What are the instance variables?

   3. 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);System.out.println("IdentifyMyParts.x = " + IdentifyMyParts.x);

Exercises

1. Write a class whose instances represent a single playing card from a deck of cards. Playing cards have two distinguishing properties: rank and suit. Be sure to keep your solution as you will be asked to rewrite it inEnum Types.

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   Hint: 

   You can use theassert statement to check your assignments. You write:

   assert (boolean expression to test);

   If the boolean expression is false, you will get an error message. For example,

   assert toString(ACE) == "Ace";

   should returntrue, so there will be no error message.

   If you use theassert statement, you must run your program with theea flag:

   java -ea YourProgram.class

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2. Write a class whose instances represent afull deck of cards. You should also keep this solution.

3. 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.

Check your answers.