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Finished some new classes^ Book2 and Book3 for exercises http://www.ntu.edu.sg/home/ehchua/programming/java/J3f_OOPExercises.html#zz-1.11 and
http://www.ntu.edu.sg/home/ehchua/programming/java/J3f_OOPExercises.html#zz-1.12
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7 files changed

+253
-12
lines changed

7 files changed

+253
-12
lines changed

‎make.bat

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javac -cp .;lib/junit-4.11.jar -d bin %1
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javac -cp .;lib/* -d bin %1.java

‎run.bat

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javac -Xlint:unchecked -cp .;lib/* -d bin %1.java
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java -cp .;lib/*;bin/ %1
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pause
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java -cp .;lib/*;bin/ %1

‎src/Book.java

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@@ -13,15 +13,15 @@
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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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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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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) {
@@ -66,7 +66,7 @@ public String getAuthorEmail() {
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public char getAuthorGender() {
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return this.author.getGender();
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}
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public String toString() {
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return "'" + name +"' by " + author;
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}

‎src/Book2.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 Book2 {
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private String name;
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private double price;
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private Author[] authors;
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private int qtyInStock = 0;
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public Book2(String name, Author[] authors, double price) {
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this.name = name;
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this.authors = authors;
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this.price = price;
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}
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public Book2(String name, Author[] authors, double price, int qtyInStock) {
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this.name = name;
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this.authors = authors;
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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 double getPrice() {
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return this.price;
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}
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public Author[] getAuthors() {
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return this.authors;
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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 void printAuthors() {
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int authorNo = 0;
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for (Author a : this.authors) {
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System.out.println("("+(++authorNo)+") "+a);
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}
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}
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public String toString() {
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return "'" + name +"' by " + authors.length + " authors";
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}
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}

‎src/Book3.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 Book3 {
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private String name;
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private double price;
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private Author[] authors = new Author[5];
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private int numAuthors = 0;
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private int qtyInStock = 0;
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public Book3(String name, double price) {
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this.name = name;
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this.price = price;
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}
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public Book3(String name, double price, int qtyInStock) {
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this.name = name;
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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 double getPrice() {
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return this.price;
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}
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public Author[] getAuthors() {
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return this.authors;
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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 void printAuthors() {
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int authorNo = 0;
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for (Author a : this.authors) {
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if (a == null) {
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continue;
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}
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System.out.println("("+(++authorNo)+") "+a);
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}
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}
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public void addAuthor(Author author)
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{
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for (int i = 0; i < authors.length; i++)
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{
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if (authors[i] != null) {
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continue;
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}
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authors[i] = author;
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++numAuthors;
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break;
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}
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}
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public boolean removeAuthorByName(String authorName)
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{
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for (int i = 0; i < authors.length; i++)
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{
85+
if (authors[i] == null) {
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continue;
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}
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if (! authorName.toUpperCase().equals(authors[i].getName().toUpperCase()) ) {
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continue;
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}
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authors[i] = null;
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--numAuthors;
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return true;
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}
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return false;
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}
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public String toString() {
102+
return "'" + name +"' by " + numAuthors + " authors";
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}
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}

‎src/TestBook2.java

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package src;
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public class TestBook2 {
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public static void main(String[] args)
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{
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Author[] authors = new Author[2];
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authors[0] = new Author("Tan Ah Teck", "ahteck@somewhere.com", 'm');
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authors[1] = new Author("Paul Tan", "Paul@nowhere.com", 'm');
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Book2 aBook = new Book2("Java for dummy", authors, 19.95, 1000);
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// Use an anonymous instance of Author
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Book2 anotherBook = new Book2(
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"more Java for dummy"
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, new Author[] {
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new Author("Bruce Eckel", "b.eckel@somewhere.com", 'm')
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, new Author("Paul Tan", "Paul@nowhere.com", 'm')
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}
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, 29.95, 888);
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// additional task #1
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System.out.println("\nThe book: " + aBook);
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System.out.println("The authors are:");
25+
aBook.printAuthors();
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27+
System.out.println("\nThe book: " + anotherBook);
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System.out.println("The authors are:");
29+
anotherBook.printAuthors();
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}
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}

‎src/TestBook3.java

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package src;
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public class TestBook3 {
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public static void main(String[] args)
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{
7+
Book3 aBook = new Book3("Java for dummy", 19.95, 1000);
8+
aBook.addAuthor(new Author("Tan Ah Teck", "ahteck@somewhere.com", 'm'));
9+
aBook.addAuthor(new Author("Paul Tan", "Paul@nowhere.com", 'm'));
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11+
// additional task #1
12+
System.out.println("\nThe book: " + aBook);
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System.out.println("The authors are:");
14+
aBook.printAuthors();
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aBook.addAuthor(new Author("Bruce Eckel", "b.eckel@somewhere.com", 'm'));
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aBook.addAuthor(new Author("Kris Datel", "k.datel@somewhere.com", 'm'));
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System.out.println("\nThe book: " + aBook);
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System.out.println("The authors are:");
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aBook.printAuthors();
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aBook.removeAuthorByName("Bruce Eckel");
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System.out.println("\nThe book: " + aBook);
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System.out.println("The authors are:");
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aBook.printAuthors();
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aBook.addAuthor(new Author("Bruce Eckel", "b.eckel@somewhere.com", 'm'));
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aBook.addAuthor(new Author("Paul Tan Junior", "PaulJunior@nowhere.com", 'm'));
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System.out.println("\nThe book: " + aBook);
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System.out.println("The authors are:");
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aBook.printAuthors();
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// ATTENTION: here new author wouldn't be added !!! NO errors - see code of Book3.java
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aBook.addAuthor(new Author("Bruce Eckel Junior", "b.eckel-junior@nowhere.com", 'm'));
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System.out.println("\nThe book: " + aBook);
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System.out.println("The authors are:");
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aBook.printAuthors();
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}
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}

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