Can create new book through UI, BookFactory now search for id instead of position in list

src/main/java/libsys/Book.java

@@ -1,7 +1,7 @@
 package libsys;
 /*
  *  Written by : Bin Hong Lee
- *  Last edited : 5/28/2017
+ *  Last edited : 5/30/2017
  */
 
 class Book
@@ -23,12 +23,11 @@ class Book
     this.status = "NOT AVAILABLE";
   }
 
-  //Constructor with book title
-  public Book(String title, int id)
+  public Book(String title, int id, String status)
   {
     this.title = title;
     this.id = id;
-    this.status = "AVAILABLE";
+    this.status = status;
   }
 
   public Book(int id, String title, String status, int[] dueDate)

src/main/java/libsys/BookFactory.java

@@ -58,7 +58,7 @@ class BookFactory
     }
 
     this.bookFilename = bookFilename;
-    id = getBook(books.size()-1).getId() + 1;
+    id = books.get(books.size() - 1).getId() + 1;
   }
 
   public void toJsonFile()
@@ -91,9 +91,9 @@ class BookFactory
     this.bookFilename = bookFilename;
   }
 
-  public Book newBook(String title)
+  public Book newBook(String title, String status)
   {
-    Book temp = new Book(title, id);
+    Book temp = new Book(title, id, status);
     books.add(temp);
 
     id++;
@@ -104,14 +104,35 @@ class BookFactory
 
   public Book getBook(int index)
   {
-    try
+    return search(index, 0, books.size() - 1);
+  }
+
+  public Book search(int index, int start, int end)
+  {
+    if (start == end && books.get(start).getId() == index)
     {
-      return books.get(index);
+      return books.get(start);
     }
-    catch (Exception e)
+
+    if (start >= end)
     {
       throw new NullPointerException();
     }
+
+    int currentId = ((start + end) / 2);
+
+    if (books.get(currentId).getId() == index)
+    {
+      return books.get(currentId);
+    }
+    else if (books.get(currentId).getId() > index)
+    {
+      return search(index, start, currentId - 1);
+    }
+    else
+    {
+      return search(index, currentId + 1, end);
+    }
   }
 
   public Book getBook(String title)

src/main/java/libsys/MainGUI.form

@@ -331,6 +331,9 @@
           <Properties>
             <Property name="text" type="java.lang.String" value="Add new book"/>
           </Properties>
+          <Events>
+            <EventHandler event="actionPerformed" listener="java.awt.event.ActionListener" parameters="java.awt.event.ActionEvent" handler="createBookBtnActionPerformed"/>
+          </Events>
         </Component>
         <Component class="javax.swing.JButton" name="createUserBtn">
           <Properties>

src/main/java/libsys/MainGUI.java

@@ -196,6 +196,11 @@ public class MainGUI extends javax.swing.JFrame
         nameLabel.setText("Welcome to abc Library");
 
         createBookBtn.setText("Add new book");
+        createBookBtn.addActionListener(new java.awt.event.ActionListener() {
+            public void actionPerformed(java.awt.event.ActionEvent evt) {
+                createBookBtnActionPerformed(evt);
+            }
+        });
 
         createUserBtn.setText("Add new user");
         createUserBtn.addActionListener(new java.awt.event.ActionListener() {
@@ -282,6 +287,17 @@ public class MainGUI extends javax.swing.JFrame
         }
     }//GEN-LAST:event_createUserBtnActionPerformed
 
+    private void createBookBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_createBookBtnActionPerformed
+        NewBookDialog newBookUI = new NewBookDialog(this, true);
+        newBookUI.setVisible(true);
+        
+        if (newBookUI.getReturnStatus() != -1)
+        {
+            bookSearch.setText(String.valueOf(handler.books.newBook(newBookUI.getName(), newBookUI.getStatus()).getId()));
+            bookSearchBtnActionPerformed(evt);
+        }
+    }//GEN-LAST:event_createBookBtnActionPerformed
+
     private void rentBtnActionPerformed(java.awt.event.ActionEvent evt)
     {
         User thisUser = handler.users.getUser(Integer.parseInt(userSearch.getText()));

src/main/java/libsys/NewBookDialog.form

@@ -0,0 +1,128 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+
+<Form version="1.3" maxVersion="1.9" type="org.netbeans.modules.form.forminfo.JDialogFormInfo">
+  <Properties>
+    <Property name="defaultCloseOperation" type="int" value="2"/>
+  </Properties>
+  <SyntheticProperties>
+    <SyntheticProperty name="formSizePolicy" type="int" value="1"/>
+    <SyntheticProperty name="generateCenter" type="boolean" value="false"/>
+  </SyntheticProperties>
+  <AuxValues>
+    <AuxValue name="FormSettings_autoResourcing" type="java.lang.Integer" value="0"/>
+    <AuxValue name="FormSettings_autoSetComponentName" type="java.lang.Boolean" value="false"/>
+    <AuxValue name="FormSettings_generateFQN" type="java.lang.Boolean" value="true"/>
+    <AuxValue name="FormSettings_generateMnemonicsCode" type="java.lang.Boolean" value="false"/>
+    <AuxValue name="FormSettings_i18nAutoMode" type="java.lang.Boolean" value="false"/>
+    <AuxValue name="FormSettings_layoutCodeTarget" type="java.lang.Integer" value="1"/>
+    <AuxValue name="FormSettings_listenerGenerationStyle" type="java.lang.Integer" value="0"/>
+    <AuxValue name="FormSettings_variablesLocal" type="java.lang.Boolean" value="false"/>
+    <AuxValue name="FormSettings_variablesModifier" type="java.lang.Integer" value="2"/>
+  </AuxValues>
+
+  <Layout>
+    <DimensionLayout dim="0">
+      <Group type="103" groupAlignment="0" attributes="0">
+          <Group type="102" attributes="0">
+              <EmptySpace max="-2" attributes="0"/>
+              <Group type="103" groupAlignment="0" attributes="0">
+                  <Group type="102" alignment="0" attributes="0">
+                      <Component id="createBtn" min="-2" max="-2" attributes="0"/>
+                      <EmptySpace pref="23" max="32767" attributes="0"/>
+                      <Component id="cancelBtn" min="-2" max="-2" attributes="0"/>
+                  </Group>
+                  <Group type="102" attributes="0">
+                      <Component id="title" min="-2" max="-2" attributes="0"/>
+                      <EmptySpace min="0" pref="100" max="32767" attributes="0"/>
+                  </Group>
+                  <Group type="102" alignment="0" attributes="0">
+                      <Group type="103" groupAlignment="0" attributes="0">
+                          <Component id="statusLbl" alignment="0" min="-2" max="-2" attributes="0"/>
+                          <Component id="titleLbl" alignment="0" min="-2" max="-2" attributes="0"/>
+                      </Group>
+                      <EmptySpace type="unrelated" max="-2" attributes="0"/>
+                      <Group type="103" groupAlignment="0" attributes="0">
+                          <Component id="titleTxtField" max="32767" attributes="0"/>
+                          <Component id="statusComboBox" max="32767" attributes="0"/>
+                      </Group>
+                  </Group>
+              </Group>
+              <EmptySpace max="-2" attributes="0"/>
+          </Group>
+      </Group>
+    </DimensionLayout>
+    <DimensionLayout dim="1">
+      <Group type="103" groupAlignment="0" attributes="0">
+          <Group type="102" alignment="0" attributes="0">
+              <EmptySpace max="-2" attributes="0"/>
+              <Component id="title" min="-2" max="-2" attributes="0"/>
+              <EmptySpace type="unrelated" max="-2" attributes="0"/>
+              <Group type="103" groupAlignment="3" attributes="0">
+                  <Component id="titleLbl" alignment="3" min="-2" max="-2" attributes="0"/>
+                  <Component id="titleTxtField" alignment="3" min="-2" max="-2" attributes="0"/>
+              </Group>
+              <EmptySpace type="separate" max="-2" attributes="0"/>
+              <Group type="103" groupAlignment="3" attributes="0">
+                  <Component id="statusLbl" alignment="3" min="-2" max="-2" attributes="0"/>
+                  <Component id="statusComboBox" alignment="3" min="-2" max="-2" attributes="0"/>
+              </Group>
+              <EmptySpace max="32767" attributes="0"/>
+              <Group type="103" groupAlignment="3" attributes="0">
+                  <Component id="createBtn" alignment="3" min="-2" max="-2" attributes="0"/>
+                  <Component id="cancelBtn" alignment="3" min="-2" max="-2" attributes="0"/>
+              </Group>
+              <EmptySpace max="-2" attributes="0"/>
+          </Group>
+      </Group>
+    </DimensionLayout>
+  </Layout>
+  <SubComponents>
+    <Component class="javax.swing.JLabel" name="title">
+      <Properties>
+        <Property name="font" type="java.awt.Font" editor="org.netbeans.beaninfo.editors.FontEditor">
+          <Font name="Lucida Grande" size="18" style="0"/>
+        </Property>
+        <Property name="text" type="java.lang.String" value="New Book"/>
+      </Properties>
+    </Component>
+    <Component class="javax.swing.JLabel" name="titleLbl">
+      <Properties>
+        <Property name="text" type="java.lang.String" value="Title :"/>
+      </Properties>
+    </Component>
+    <Component class="javax.swing.JLabel" name="statusLbl">
+      <Properties>
+        <Property name="text" type="java.lang.String" value="Status :"/>
+      </Properties>
+    </Component>
+    <Component class="javax.swing.JButton" name="createBtn">
+      <Properties>
+        <Property name="text" type="java.lang.String" value="Add book"/>
+      </Properties>
+      <Events>
+        <EventHandler event="actionPerformed" listener="java.awt.event.ActionListener" parameters="java.awt.event.ActionEvent" handler="createBtnActionPerformed"/>
+      </Events>
+    </Component>
+    <Component class="javax.swing.JButton" name="cancelBtn">
+      <Properties>
+        <Property name="text" type="java.lang.String" value="Cancel"/>
+      </Properties>
+      <Events>
+        <EventHandler event="actionPerformed" listener="java.awt.event.ActionListener" parameters="java.awt.event.ActionEvent" handler="cancelBtnActionPerformed"/>
+      </Events>
+    </Component>
+    <Component class="javax.swing.JTextField" name="titleTxtField">
+    </Component>
+    <Component class="javax.swing.JComboBox" name="statusComboBox">
+      <Properties>
+        <Property name="model" type="javax.swing.ComboBoxModel" editor="org.netbeans.modules.form.RADConnectionPropertyEditor">
+          <Connection code="new javax.swing.DefaultComboBoxModel(statusOptions)" type="code"/>
+        </Property>
+      </Properties>
+      <AuxValues>
+        <AuxValue name="JavaCodeGenerator_CreateCodeCustom" type="java.lang.String" value="new javax.swing.JComboBox()"/>
+        <AuxValue name="JavaCodeGenerator_TypeParameters" type="java.lang.String" value="&lt;String&gt;"/>
+      </AuxValues>
+    </Component>
+  </SubComponents>
+</Form>

src/main/java/libsys/NewBookDialog.java

@@ -0,0 +1,195 @@
+package libsys;
+
+public class NewBookDialog extends javax.swing.JDialog {
+
+    /**
+     * Creates new form NewBookDialog
+     * @param parent
+     * @param modal
+     */
+    public NewBookDialog(java.awt.Frame parent, boolean modal) {
+        super(parent, modal);
+        initComponents();
+    }
+
+    /**
+     * @return the return status of this dialog - one of RET_OK or RET_CANCEL
+     */
+    public int getReturnStatus() {
+        return returnStatus;
+    }
+
+    @Override
+    public String getName() {
+        return name;
+    }
+
+    public String getStatus()
+    {
+        return status;
+    }
+
+    /**
+     * 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")
+    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
+    private void initComponents() {
+
+        title = new javax.swing.JLabel();
+        titleLbl = new javax.swing.JLabel();
+        statusLbl = new javax.swing.JLabel();
+        createBtn = new javax.swing.JButton();
+        cancelBtn = new javax.swing.JButton();
+        titleTxtField = new javax.swing.JTextField();
+        statusComboBox = new javax.swing.JComboBox();
+
+        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
+
+        title.setFont(new java.awt.Font("Lucida Grande", 0, 18)); // NOI18N
+        title.setText("New Book");
+
+        titleLbl.setText("Title :");
+
+        statusLbl.setText("Status :");
+
+        createBtn.setText("Add book");
+        createBtn.addActionListener(new java.awt.event.ActionListener() {
+            public void actionPerformed(java.awt.event.ActionEvent evt) {
+                createBtnActionPerformed(evt);
+            }
+        });
+
+        cancelBtn.setText("Cancel");
+        cancelBtn.addActionListener(new java.awt.event.ActionListener() {
+            public void actionPerformed(java.awt.event.ActionEvent evt) {
+                cancelBtnActionPerformed(evt);
+            }
+        });
+
+        statusComboBox.setModel(new javax.swing.DefaultComboBoxModel(statusOptions));
+
+        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.createSequentialGroup()
+                        .addComponent(createBtn)
+                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 23, Short.MAX_VALUE)
+                        .addComponent(cancelBtn))
+                    .addGroup(layout.createSequentialGroup()
+                        .addComponent(title)
+                        .addGap(0, 100, Short.MAX_VALUE))
+                    .addGroup(layout.createSequentialGroup()
+                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
+                            .addComponent(statusLbl)
+                            .addComponent(titleLbl))
+                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
+                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
+                            .addComponent(titleTxtField)
+                            .addComponent(statusComboBox, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
+                .addContainerGap())
+        );
+        layout.setVerticalGroup(
+            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
+            .addGroup(layout.createSequentialGroup()
+                .addContainerGap()
+                .addComponent(title)
+                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
+                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
+                    .addComponent(titleLbl)
+                    .addComponent(titleTxtField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
+                .addGap(18, 18, 18)
+                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
+                    .addComponent(statusLbl)
+                    .addComponent(statusComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
+                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
+                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
+                    .addComponent(createBtn)
+                    .addComponent(cancelBtn))
+                .addContainerGap())
+        );
+
+        pack();
+    }// </editor-fold>//GEN-END:initComponents
+
+    private void createBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_createBtnActionPerformed
+        status = statusOptions[statusComboBox.getSelectedIndex()];
+        name = titleTxtField.getText();
+        doClose(1);
+    }//GEN-LAST:event_createBtnActionPerformed
+
+    private void cancelBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cancelBtnActionPerformed
+        doClose(-1);
+    }//GEN-LAST:event_cancelBtnActionPerformed
+
+    private void doClose(int retStatus) {
+        returnStatus = retStatus;
+        setVisible(false);
+        dispose();
+    }
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String args[]) {
+        /* Set the Nimbus look and feel */
+        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
+        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
+         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
+         */
+        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(NewBookDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (InstantiationException ex) {
+            java.util.logging.Logger.getLogger(NewBookDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (IllegalAccessException ex) {
+            java.util.logging.Logger.getLogger(NewBookDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
+            java.util.logging.Logger.getLogger(NewBookDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        }
+        //</editor-fold>
+
+        /* Create and display the dialog */
+        java.awt.EventQueue.invokeLater(new Runnable() {
+            @Override
+            public void run() {
+                NewBookDialog dialog = new NewBookDialog(new javax.swing.JFrame(), true);
+                dialog.addWindowListener(new java.awt.event.WindowAdapter() {
+                    @Override
+                    public void windowClosing(java.awt.event.WindowEvent e) {
+                        System.exit(0);
+                    }
+                });
+                dialog.setVisible(true);
+            }
+        });
+    }
+
+    // Variables declaration - do not modify//GEN-BEGIN:variables
+    private javax.swing.JButton cancelBtn;
+    private javax.swing.JButton createBtn;
+    private javax.swing.JComboBox<String> statusComboBox;
+    private javax.swing.JLabel statusLbl;
+    private javax.swing.JLabel title;
+    private javax.swing.JLabel titleLbl;
+    private javax.swing.JTextField titleTxtField;
+    // End of variables declaration//GEN-END:variables
+
+    private int returnStatus = -1;
+    private String name;
+    private String status;
+    private String[] statusOptions = new String[] { "AVAILABLE", "NOT AVAILABLE", "RESERVED" };
+
+}

src/main/java/libsys/NewUserDialog.form

@@ -28,7 +28,7 @@
               <Group type="103" groupAlignment="0" attributes="0">
                   <Group type="102" alignment="0" attributes="0">
                       <Component id="createBtn" min="-2" max="-2" attributes="0"/>
-                      <EmptySpace pref="13" max="32767" attributes="0"/>
+                      <EmptySpace max="32767" attributes="0"/>
                       <Component id="cancelBtn" min="-2" max="-2" attributes="0"/>
                   </Group>
                   <Group type="102" attributes="0">
@@ -36,7 +36,7 @@
                           <Component id="title" alignment="0" min="-2" max="-2" attributes="0"/>
                           <Component id="errorLbl" alignment="0" min="-2" max="-2" attributes="0"/>
                       </Group>
-                      <EmptySpace min="0" pref="0" max="32767" attributes="0"/>
+                      <EmptySpace min="0" pref="13" max="32767" attributes="0"/>
                   </Group>
                   <Group type="102" alignment="0" attributes="0">
                       <Group type="103" groupAlignment="0" attributes="0">
@@ -102,7 +102,7 @@
     </Component>
     <Component class="javax.swing.JButton" name="createBtn">
       <Properties>
-        <Property name="text" type="java.lang.String" value="Create user"/>
+        <Property name="text" type="java.lang.String" value="Add user"/>
       </Properties>
       <Events>
         <EventHandler event="actionPerformed" listener="java.awt.event.ActionListener" parameters="java.awt.event.ActionEvent" handler="createBtnActionPerformed"/>

src/main/java/libsys/NewUserDialog.java

@@ -1,9 +1,5 @@
 package libsys;
 
-/**
- *
- * @author binhonglee
- */
 public class NewUserDialog extends javax.swing.JDialog {
 
     /**
@@ -13,18 +9,18 @@ public class NewUserDialog extends javax.swing.JDialog {
         super(parent, modal);
         initComponents();
     }
-    
+
     /**
      * @return the return status of this dialog - one of RET_OK or RET_CANCEL
      */
     public int getReturnStatus() {
         return returnStatus;
     }
-    
+
     public String getName() {
         return name;
     }
-    
+
     public int getLimit()
     {
         return limit;
@@ -57,7 +53,7 @@ public class NewUserDialog extends javax.swing.JDialog {
 
         limitLbl.setText("Limit :");
 
-        createBtn.setText("Create user");
+        createBtn.setText("Add user");
         createBtn.addActionListener(new java.awt.event.ActionListener() {
             public void actionPerformed(java.awt.event.ActionEvent evt) {
                 createBtnActionPerformed(evt);
@@ -83,13 +79,13 @@ public class NewUserDialog extends javax.swing.JDialog {
                 .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                     .addGroup(layout.createSequentialGroup()
                         .addComponent(createBtn)
-                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 13, Short.MAX_VALUE)
+                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                         .addComponent(cancelBtn))
                     .addGroup(layout.createSequentialGroup()
                         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                             .addComponent(title)
                             .addComponent(errorLbl))
-                        .addGap(0, 0, Short.MAX_VALUE))
+                        .addGap(0, 13, Short.MAX_VALUE))
                     .addGroup(layout.createSequentialGroup()
                         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                             .addComponent(limitLbl)
@@ -141,7 +137,7 @@ public class NewUserDialog extends javax.swing.JDialog {
     private void cancelBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cancelBtnActionPerformed
         doClose(-1);
     }//GEN-LAST:event_cancelBtnActionPerformed
-    
+
     private void doClose(int retStatus) {
         returnStatus = retStatus;
         setVisible(false);
@@ -155,7 +151,7 @@ public class NewUserDialog extends javax.swing.JDialog {
         /* Set the Nimbus look and feel */
         //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
         /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
-         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
+         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
          */
         try {
             for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {

src/main/java/libsys/UserFactory.java

@@ -4,17 +4,17 @@ package libsys;
  *  Last edited : 5/30/2017
  */
 
- import java.util.List;
- import java.util.ArrayList;
- import org.json.JSONString;
- import org.json.JSONObject;
- import org.json.JSONTokener;
- import org.json.JSONArray;
- import java.io.FileInputStream;
- import java.io.PrintWriter;
- import java.io.File;
- import java.util.Enumeration;
- import java.io.Serializable;
+import java.util.List;
+import java.util.ArrayList;
+import org.json.JSONString;
+import org.json.JSONObject;
+import org.json.JSONTokener;
+import org.json.JSONArray;
+import java.io.FileInputStream;
+import java.io.PrintWriter;
+import java.io.File;
+import java.util.Enumeration;
+import java.io.Serializable;
 
 class UserFactory
 {