Answered: 1) Create class Cat Add properties…

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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in java

1) Create class Cat
Add properties
What characteristics do they have?
Name, age, color, type (domestic / feral), etc.
What color(s) might they have?
White, cream, fawn, Cinnamon, Chocolate, Red, Lilac, Blue, Black,
Lavender, etc.
Add methods
eat(), play(), etc.
Constructors?
A class provides a special type of methods, known as constructors, which are
invoked to construct objects from the class
Create 2 different constructor with different initialization parameters
How to get the number of cats?
Add a static variable and a static method
Test Cat class by creating 2 Cat instances

2) create a class AbstractCat with the same
properties and methods as Cat...
Create class AbstractCat.
How to secure data?
To protect it from direct access and manipulation from outside of the class
we need to make our instance data fields private.
To let clients still manipulate data under our control we can provide them
public getters and setters.
create getters, setters, constructors and toString()
Test AbstractCat class

Expert Solution

Step 1: Outline of the given question

The first question asked for the creation of a Java class called Cat with properties, methods, constructors, and a static variable to count the number of cat instances. Additionally, it requested testing the Cat class by creating two instances.

The second question required the creation of an abstract Java class named AbstractCat with properties, methods, constructors, and getter/setter methods similar to the Cat class. It also asked for the addition of an abstract method called makeSound. Subclasses, DomesticCat and FeralCat, were to be created to implement the makeSound method, and a sample program was to demonstrate the use of these classes.

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