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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Question

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: Creating class Cat

1public class Cat {
2    // Properties
3    private String name;
4    private int age;
5    private String color;
6    private String type;
7
8    // Constructors
9    public Cat(String name, int age, String color, String type) {
10        this.name = name;
11        this.age = age;
12        this.color = color;
13        this.type = type;
14    }
15
16    public Cat(String name, int age) {
17        this(name, age, "Unknown", "Unknown");
18    }
19
20    // Methods
21    public void eat() {
22        System.out.println(name + " is eating.");
23    }
24
25    public void play() {
26        System.out.println(name + " is playing.");
27    }
28
29    // Static variable to keep track of the number of cats
30    private static int numberOfCats = 0;
31
32    // Static method to get the number of cats
33    public static int getNumberOfCats() {
34        return numberOfCats;
35    }
36
37    // Increment the count when a new cat is created
38    {
39        numberOfCats++;
40    }
41
42    // Getter and Setter methods
43    public String getName() {
44        return name;
45    }
46
47    public void setName(String name) {
48        this.name = name;
49    }
50
51    public int getAge() {
52        return age;
53    }
54
55    public void setAge(int age) {
56        this.age = age;
57    }
58
59    public String getColor() {
60        return color;
61    }
62
63    public void setColor(String color) {
64        this.color = color;
65    }
66
67    public String getType() {
68        return type;
69    }
70
71    public void setType(String type) {
72        this.type = type;
73    }
74
75    // toString method for printing cat details
76    @Override
77    public String toString() {
78        return "Cat [name=" + name + ", age=" + age + ", color=" + color + ", type=" + type + "]";
79    }
80
81    public static void main(String[] args) {
82        // Test Cat class by creating two Cat instances
83        Cat cat1 = new Cat("Whiskers", 3, "White", "Domestic");
84        Cat cat2 = new Cat("Tiger", 2);
85
86        System.out.println(cat1);
87        System.out.println(cat2);
88
89        // Get the number of cats
90        System.out.println("Total number of cats: " + Cat.getNumberOfCats());
91    }
92}

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