Answered: Create a class Animal with a…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Create a class Animal with a constructor that takes no parameters and has an instance variable:

private int energy;

When an animal is "born," it has one unit of energy. It has the methods:

public void eat(int amountToEat) - which increases the amount of energy the animal has by amountToEat
public void move(int amountToMove) - which decreases the energy the animal has by amountToMove.
public int getEnergy() - which returns the amount of energy left

Notice there is no setEnergy method. Energy is only changed by eating or moving.

You should also create a subclass BetterAnimal which has a cap on the amount of energy an animal can have.

The constructor takes a parameter that specifies a maximum for energy. You will need to save this in another instance variable.

Override the eat and move methods

In the eat method: If the amount the BetterAnimal eats would set its energy above the max, the energy level is only increased to the max. Also energy is only changed if the amount > 0
In the move method: Energy changes only if amount > 0. The energy can never be less than 0. If an BetterAnimal has an energy of 2 and tries to move 5, its energy will be 0.

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