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Question: My assignment asked the following. I am unable to ...
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My assignment asked the following. I am unable to get the UI working and having trouble with the rest of the bullet points below. Answer in code only is fine, once I see it, it usually makes a lot more sense. Any help would be appreciated!!
· Create a user interface for the Library application that allows the user (i.e., the Librarian) to enter Book objects.
· Create a business layer manager, BookMgr, with the following stubbed-out method: public Book storeBook(Book book). The add button will cause the user-supplied information to be packaged into a domain Book object. It will also:
· Pass the domain Book object to the BookMgr.storeBook function.
· Display the state of the Book using its overridden toString() method; e.g System.out.println(book.toString());
CODE
package libraryapp;
public class Book {
private String[] author;
private int ISBN;
private String title;
// Constructor
public Book(String authors[], int ISBN, String title) {
this.author = new String[authors.length];
for (int i = 0; i < author.length; i++) {
author[i] = authors[i];
}
this.ISBN = ISBN;
this.title = title;
}
public Book() {
throw new UnsupportedOperationException("Not supported yet.");
}
public String[] getAuthor() {
return this.author;
}
public int getIsbn() {
return this.ISBN;
}
public String getTitle() {
return this.title;
}
public void setAuthor(String[] author) {
this.author = author;
}
public void setISBN(int ISBN) {
this.ISBN = ISBN;
}
public void setTitle(String title) {
this.title = title;
}
public boolean validate() {
if (author == null || author.equals(""))
return false;
if (title == null || title.equals(""))
return false;
if (ISBN == 0)
return false;
return true;
}
}
FORM
package libraryapp;
public class BookForm extends javax.swing.JFrame {
/**
* Creates new form BookForm
*/
public BookForm() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
//
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jTextField2 = new javax.swing.JTextField();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("Arial", 1, 24)); // NOI18N
jLabel1.setText("Library Application");
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});
jLabel2.setText("Enter Book Title");
jLabel3.setText("Entered Book");
jButton2.setText("OK");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jLabel1)
.addComponent(jTextField1)
.addComponent(jLabel2)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 85, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField2))
.addComponent(jButton2))
.addContainerGap(170, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addGap(33, 33, 33)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton2)
.addGap(14, 14, 14)
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(78, Short.MAX_VALUE))
);
pack();
}//
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(BookForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(BookForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(BookForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(BookForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new BookForm().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
// End of variables declaration
}
TEST
package libraryapp;
import org.junit.Test;
import static org.junit.Assert.*;
public class BookTest {
public BookTest() {
}
/**
* Test of getAuthor method, of class Book.
*/
@Test
public void testGetAuthor() {
System.out.println("getAuthor");
Book instance = new Book(new String[]{"Mouse"},123, "Mickey Mouse");
String[] expResult = new String[]{"Mouse"};
String[] result = instance.getAuthor();
assertEquals(expResult[0], result[0]);
}
/**
* Test of getIsbn method, of class Book.
*/
@Test
public void testGetIsbn() {
System.out.println("getIsbn");
Book instance = new Book(new String[]{"Mickey","Mouse"},123, "Mickey Mouse");
int expResult = 123;
int result = instance.getIsbn();
assertEquals(expResult, result);
}
/**
* Test of getTitle method, of class Book.
*/
@Test
public void testGetTitle() {
System.out.println("getTitle");
Book instance = new Book(new String[]{"Mickey","Mouse"},123, "Mickey Mouse");
String expResult = "Mickey Mouse";
String result = instance.getTitle();
assertEquals(expResult, result);
}
/**
* Test of setAuthor method, of class Book.
*/
@Test
public void testSetAuthor() {
System.out.println("setAuthor");
String author = "Mouse";
Book instance = new Book(new String[]{},123, "Micky Mouse");
instance.setAuthor(new String[]{author});
assertEquals(author, instance.getAuthor()[0]);
}
/**
* Test of setISBN method, of class Book.
*/
@Test
public void testSetISBN() {
System.out.println("setISBN");
int ISBN = 0;
Book instance = new Book(new String[]{"Mickey"}, 123, "Mickey Mouse");
instance.setISBN(ISBN);
assertEquals(ISBN, instance.getIsbn());
}
/**
* Test of setTitle method, of class Book.
*/
@Test
public void testSetTitle() {
System.out.println("setTitle");
String title = "Mickey";
Book instance = new Book(new String[]{"Mickey"}, 123, "Mickey Mouse");
instance.setTitle(title);
assertEquals(title, instance.getTitle());
}
/**
* Test of validate method, of class Book.
*/
@Test
public void testValidate() {
System.out.println("validate");
Book instance = new Book(new String[]{"Mickey"}, 0, "Mickey Mouse");
boolean expResult = false;
boolean result = instance.validate();
assertEquals(expResult, result);
}
}
Explanation / Answer
Your GUI displays properly without issue. Issue is in doing actions. Actions should be performed for buttons. But the code is designed in different manner. I've provided comments in BookForm.java which would be useful for you once you get the requirement clarified (please read the comment in BookForm.java to understand more).
Apart from that, I've modified Book.java and added a new class BookMgr.java
PROGRAM CODE:
Book.java
package libraryapp;
public class Book {
private String[] author;
private int ISBN;
private String title;
// Constructor
public Book(String authors[], int ISBN, String title) {
this.author = new String[authors.length];
for (int i = 0; i < author.length; i++) {
author[i] = authors[i];
}
this.ISBN = ISBN;
this.title = title;
}
public Book() {
throw new UnsupportedOperationException("Not supported yet.");
}
public String[] getAuthor() {
return this.author;
}
public int getIsbn() {
return this.ISBN;
}
public String getTitle() {
return this.title;
}
public void setAuthor(String[] author) {
this.author = author;
}
public void setISBN(int ISBN) {
this.ISBN = ISBN;
}
public void setTitle(String title) {
this.title = title;
}
public boolean validate() {
if (author == null || author.equals(""))
return false;
if (title == null || title.equals(""))
return false;
if (ISBN == 0)
return false;
return true;
}
//Added this method to print the book information
@Override
public String toString() {
String result = "Author: ";
for(String s: author)
result += s + ", ";
result += " ISBN: " + ISBN + ", Title: " + title;
return result;
}
}
BookMgr.java
package libraryapp;
import java.util.ArrayList;
public class BookMgr {
ArrayList<Book> books;
public BookMgr() {
books = new ArrayList<>();
}
public void storeBook(Book book)
{
books.add(book);
System.out.println(book);
}
}
BookForm.java
package libraryapp;
public class BookForm extends javax.swing.JFrame {
BookMgr manager;
/**
* Creates new form BookForm
*/
public BookForm() {
manager = new BookMgr();
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
//
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jTextField2 = new javax.swing.JTextField();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("Arial", 1, 24)); // NOI18N
jLabel1.setText("Library Application");
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});
jLabel2.setText("Enter Book Title");
jLabel3.setText("Entered Book");
jButton2.setText("OK");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jLabel1)
.addComponent(jTextField1)
.addComponent(jLabel2)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 85, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField2))
.addComponent(jButton2))
.addContainerGap(170, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addGap(33, 33, 33)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton2)
.addGap(14, 14, 14)
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(78, Short.MAX_VALUE))
);
pack();
}//
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
/* there must be a handler for button and not for textfield.
The requirement is needed here. Also based on what I understand you need to get
Book title,
Book authors,
and ISBN
from the user interface and then create a book object using those
i.e Book book = new Book(authros, ISBN, title);
after this use BookMgr object declared here to store the book in the arraylist
by calling manager.storeBook(book);
There is comment in your code that says not to edit initComponents() method.
If it can be edited, then a button listener should be added along with some textfields for the remianing
fields other than title.
*/
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(BookForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(BookForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(BookForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(BookForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new BookForm().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
// End of variables declaration
}
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