Refactoring.

src/main/java/com/mycompany/bookstore/Book.java

@@ -35,11 +35,6 @@ public class Book {
      */
     private String details;
 
-    /**
-     *
-     */
-    private int quantity;
-
     /**
      *
      */
@@ -58,7 +53,6 @@ public Book() {
         details = "Empty";
         name = "Unknown";
         value = -1;
-        quantity = 0;
         cover = new javax.swing.ImageIcon(getClass().getResource("/icon50x50.png"));
     }
 
@@ -75,7 +69,6 @@ public Book(int id, String name, float value, String details) {
         this.details = details;
         this.name = name;
         this.value = value;
-        this.quantity = 1;
         this.cover = new javax.swing.ImageIcon(getClass().getResource("/icon50x50.png"));;
     }
 
@@ -86,15 +79,13 @@ public Book(int id, String name, float value, String details) {
      * @param name Nome do livro.
      * @param value Valor do livro.
      * @param details Detalhes do livro.
-     * @param quantity Quantidade de livro.
      * @param cover Capa do livro.
      */
-    public Book(int id, String name, float value, String details, int quantity, ImageIcon cover) {
+    public Book(int id, String name, float value, String details, ImageIcon cover) {
         this.id = id;
         this.details = details;
         this.name = name;
         this.value = value;
-        this.quantity = quantity;
         this.cover = cover;
     }
 
@@ -179,20 +170,6 @@ public void setDetails(String details) {
         this.details = details;
     }
 
-    /**
-     *
-     */
-    public int getQuantity() {
-        return quantity;
-    }
-
-    /**
-     *
-     */
-    public void setQuantity(int quantity) {
-        this.quantity = quantity;
-    }
-
     /**
      *
      */

src/main/java/com/mycompany/bookstore/gui/BookDetails.java

@@ -13,6 +13,7 @@
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 import java.util.ArrayList;
+import java.util.Map;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -34,9 +35,9 @@ public class BookDetails extends javax.swing.JPanel {
     /**
      * Creates new form BookDetails
      */
-    public BookDetails(BookStore store, Book book) {
+    public BookDetails(BookStore store, Map.Entry<Book, Integer> entry) {
         this.store = store;
-        this.book = book;
+        this.book = entry.getKey();
 
         initComponents();
 
@@ -62,7 +63,7 @@ public void mouseClicked(MouseEvent e) {
         });
 
         titleLabel.setText(book.getName());
-        quantityLabel.setText(String.valueOf(book.getQuantity()));
+        quantityLabel.setText(String.valueOf(entry.getValue()));
         supplierLabel.setText("By Amazon");
         valueLabel1.setText(String.valueOf(book.getValue()));
 

src/main/java/com/mycompany/bookstore/gui/BookList.java

@@ -12,7 +12,8 @@
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
-import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
 import javax.swing.DefaultListModel;
 import javax.swing.JList;
 import javax.swing.ListCellRenderer;
@@ -25,12 +26,12 @@ public class BookList extends javax.swing.JPanel {
     /**
      * Creates new form BookList
      */
-    public BookList(BookStore store, ArrayList<Book> books) {
+    public BookList(BookStore store, HashMap<Book, Integer> books) {
         initComponents();
 
         DefaultListModel<BookDetails> listModel = new DefaultListModel<>();
-        for (Book b : books) {
-            listModel.addElement(new BookDetails(store, b));
+        for (Map.Entry entry : books.entrySet()) {
+            listModel.addElement(new BookDetails(store, entry));
         }
 
         FlowLayout layoyt = new FlowLayout();

src/main/java/com/mycompany/bookstore/gui/BookStoreGUI.java

@@ -16,7 +16,6 @@
 import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
-import java.util.ArrayList;
 import java.util.Map;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -143,7 +142,7 @@ public void mouseClicked(MouseEvent e) {
                 dialog.setLocationRelativeTo(BookStoreGUI.this);
                 dialog.setLayout(new FlowLayout());
                 dialog.setSize(500, 400);
-                dialog.add(new BookList(store, new ArrayList<>(customer.getCart().getBooks().keySet())));
+                dialog.add(new BookList(store, customer.getCart().getBooks()));
 
                 dialog.setVisible(true);
             }

src/main/java/com/mycompany/bookstore/gui/CustomerPanel.java

@@ -4,10 +4,11 @@
  */
 package com.mycompany.bookstore.gui;
 
+import com.mycompany.bookstore.Book;
 import com.mycompany.bookstore.BookStore;
 import com.mycompany.bookstore.Customer;
 import java.awt.FlowLayout;
-import java.util.ArrayList;
+import java.util.HashMap;
 
 /**
  *
@@ -21,11 +22,16 @@ public CustomerPanel(BookStore store) {
         initComponents();
 
         allBooksPane.setLayout(new FlowLayout());
-        allBooksPane.add(new BookList(store, new ArrayList<>(store.getAvailableBooks().keySet())));
+        allBooksPane.add(new BookList(store, store.getAvailableBooks()));
 
         starredBooksPane.setLayout(new FlowLayout());
+
         Customer customer = (Customer) store.getUser();
-        starredBooksPane.add(new BookList(store, customer.getFavorites()));
+        HashMap<Book, Integer> hashMap = new HashMap<>();
+        for (Book b : customer.getFavorites()) {
+            hashMap.put(b, 1);
+        }
+        starredBooksPane.add(new BookList(store, hashMap));
     }
 
     /**

src/main/java/com/mycompany/bookstore/gui/SupplierPanel.java

@@ -7,7 +7,7 @@
 import com.mycompany.bookstore.BookStore;
 import com.mycompany.bookstore.Supplier;
 import java.awt.FlowLayout;
-import java.util.ArrayList;
+import java.util.HashMap;
 
 /**
  *
@@ -21,12 +21,12 @@ public SupplierPanel(BookStore store) {
         initComponents();
 
         salesPane.setLayout(new FlowLayout());
-        BookList bookList1 = new BookList(store, new ArrayList<>());
+        BookList bookList1 = new BookList(store, new HashMap<>());
         salesPane.add(bookList1);
 
         stockPane.setLayout(new FlowLayout());
         Supplier supplier = (Supplier) store.getUser();
-        BookList bookList2 = new BookList(store, new ArrayList<>(supplier.getEstoque().keySet()));
+        BookList bookList2 = new BookList(store, supplier.getEstoque());
         stockPane.add(bookList2);
     }