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Trail: Learning the Java Language
Lesson: Classes and Inheritance

## Questions and Exercises: Creating Classes

### Questions

> 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?

> > b. How many instance variables does the `IdentifyMyParts` class contain? What are their names?

> > 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);

### Exercises

> 1. Write a class whose instances represent a playing card from a deck of cards.

> 2. Write a class whose instances represents a deck of cards.

> 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.

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