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java-tester-x
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Add few classes
Add few classes
1 parent 40be11a commit d00db76

6 files changed

Lines changed: 182 additions & 7 deletions

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‎src/Author.java‎

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package src;
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public class Author {
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private String name;
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private String email;
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private char gender;
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public Author (String name, String email, char gender) {
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this.name = name;
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this.email = email;
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this.gender = gender;
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}
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public String getName() {
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return this.name;
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}
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public String getEmail() {
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return this.email;
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}
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public void setEmail(String setEmail) {
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this.email = setEmail;
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}
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public char getGender() {
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return this.gender;
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}
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public String toString() {
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return name + " (" + gender + ") at " + email;
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}
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}

‎src/Book.java‎

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package src;
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/**
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* A class called circle is designed as shown in the following class diagram. It contains:
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*
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* 1) Two private instance variables: radius (of type double) and color (of type String),
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* with default value of 1.0 and "red", respectively.
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* 2) Two overloaded constructors;
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* 3) Two public methods: getRadius() and getArea().
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*
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* The source codes for Circle is as follows:
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*/
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public class Book {
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private String name;
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private double price;
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private Author author;
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private int qtyInStock = 0;
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public Book (String name, Author author, double price) {
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this.name = name;
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this.author = author;
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this.price = price;
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}
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public Book (String name, Author author, double price, int qtyInStock) {
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this.name = name;
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this.author = author;
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this.price = price;
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this.qtyInStock = qtyInStock;
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}
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public String getName() {
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return this.name;
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}
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public Author getAuthor() {
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return this.author;
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}
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public double getPrice() {
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return this.price;
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}
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public void setPrice(double price) {
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this.price = price;
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}
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public int getQtyInStock() {
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return this.qtyInStock;
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}
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public void setQtyInStock(int qtyInStock) {
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this.qtyInStock = qtyInStock;
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}
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public String toString() {
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return "'" + name +"' by " + author;
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}
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}

‎src/Circle.java‎

Lines changed: 30 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -18,14 +18,20 @@ public class Circle {
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// 1st constructor, which sets both radius and color to default
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public Circle() {
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radius = 1.0;
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color = "red";
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this.radius = 1.0;
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this.color = "red";
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}
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// 2nd constructor with given radius, but color default
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public Circle(double r) {
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radius = r;
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color = "red";
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public Circle(double radius) {
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this.radius = radius;
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this.color = "red";
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}
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// Construtor to construct a new instance of Circle with the given radius and color
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public Circle (double radius, String color) {
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this.radius = radius;
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this.color = color;
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}
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// A public method for retrieving the radius
@@ -37,4 +43,23 @@ public double getRadius() {
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public double getArea() {
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return radius*radius*Math.PI;
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}
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// Getter for instance variable color
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public String getColor() {
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return color;
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}
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// Setter for instance variable radius
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public void setRadius(double radius) {
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this.radius = radius;
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}
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// Setter for instance variable color
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public void setColor(String color) {
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this.color = color;
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}
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public String toString() {
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return "Circle: radius=" + radius + " color=" + color;
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}
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}

‎src/TestAuthor.java‎

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package src;
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public class TestAuthor {
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public static void main(String[] args)
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{
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Author anAuthor = new Author("Tan Ah Teck", "ahteck@somewhere.com", 'm');
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System.out.println(anAuthor); // call toString()
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anAuthor.setEmail("paul@nowhere.com");
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System.out.println(anAuthor);
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}
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}

‎src/TestBook.java‎

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package src;
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public class TestBook {
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public static void main(String[] args)
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{
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Author anAuthor = new Author("Tan Ah Teck", "ahteck@somewhere.com", 'm');
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Book aBook = new Book("Java for dummy", anAuthor, 19.95, 1000);
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// Use an anonymous instance of Author
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Book anotherBook = new Book(
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"more Java for dummy"
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, new Author("Bruce Eckel", "b.eckel@somewhere.com", 'm')
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, 29.95, 888);
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}
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}

‎src/TestCircle.java‎

Lines changed: 28 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,13 +7,39 @@ public static void main(String[] args) {
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Circle c1 = new Circle();
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// Use the dot operator to invoke methods of instance c1.
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System.out.println("The circle has radius of "
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+ c1.getRadius() + " and area of " + c1.getArea());
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+ c1.getRadius() + " and area of " + c1.getArea()
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+ " and color of " + c1.getColor());
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// Declare and allocate an instance of class circle called c2
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// with the given radius and default color
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Circle c2 = new Circle(2.0);
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// Use the dot operator to invoke methods of instance c2.
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System.out.println("The circle has radius of "
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+ c2.getRadius() + " and area of " + c2.getArea());
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+ c2.getRadius() + " and area of " + c2.getArea()
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+ " and color of " + c2.getColor());
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// Declare and allocate an instance of class circle called c2
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// with the given radius and default color
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Circle c3 = new Circle(2.0, "blue");
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// Use the dot operator to invoke methods of instance c2.
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System.out.println("The circle has radius of "
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+ c3.getRadius() + " and area of " + c3.getArea()
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+ " and color of " + c3.getColor());
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Circle c4 = new Circle(); // construct an instance of Circle
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c4.setRadius(5.0); // change radius
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c4.setColor("green"); // change color
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System.out.println("The circle has radius of "
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+ c4.getRadius() + " and area of " + c4.getArea()
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+ " and color of " + c4.getColor());
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Circle c5 = new Circle(5.0);
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System.out.println(c5.toString()); // explicit call
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Circle c6 = new Circle(1.2);
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System.out.println(c6); // println() calls toString() implicitly, same as above
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System.out.println("Operator '+' invokes toString() too: " + c6); // '+' invokes toString() too
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}
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}

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