CS 201: Inheritance Practice (pair assignment)

This is a pair programming assignment. If you are on a team, this means that you and your partner should be doing the entirety of this assignment side-by-side, on a single computer, where one person is "driving" and the other is "navigating." Take turns every so often who is driving; you should each spend approximately 50% of the time driving.

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Here is an interface that represents a virtual Pet.

public interface Pet
{
    void reward(int numTimes);
    void punish(int numTimes);
    void act();
}

Your task is to create two implementation classes for Pet, named Dog and Cat. Each one of them should implement the three methods above appropriately, as well as contain a relevant constructor. Here are some more details:

• Each Pet object should keep track of an "amount of happiness" (an integer that starts off as 0) as an instance variable.
• For a Dog, the method reward should increase happiness by 3 each time the animal is rewarded. For a Cat, it should only increase happiness by 1 each time the animal is rewarded. (Cats are harder to impress.)
• For a Dog, the method punish should decrease happiness by 2 each time the animal is punished. For a Cat, it should decrease happiness by 3 each time the animal is punished. (Cats are more likely to sulk.)
• Create a method act() that will do two things: print out to the screen the current happiness value for the animal, and then act accordingly by printing out some kind of animal noise. Regarding the animal noise, be creative: how might a dog or cat act differently depending on the happiness value? What might be different in the rules that you use, between a dog and a cat? There's no "right answer" for how to act (apart from printing out the current happiness value first), but do something interesting that's different between the two.

If you've written your class correctly, the following test code should work if you place it inside an appropriate main method:

    Pet fido = new Dog();
    Pet socks = new Cat();

    fido.reward(5);
    socks.punish(3);

    fido.act();
    socks.act();

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Note that starting with this assignment, we will also be grading your submitted code for good style. This style guide contains ideas for good style that you should be observing.