I can get the following to work it won\'t sort the phone_numbers.dat file for th
ID: 3714131 • Letter: I
Question
I can get the following to work it won't sort the phone_numbers.dat file for the java program
Complete the implementation for the Sort menu item in the Edit menu. When Sort is selected, the entries should be sorted and displayed alphabetically according to last name + first name.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import java.util.Vector;
import java.util.ArrayList;
public class ContactList extends JFrame implements ActionListener, ListSelectionListener {
JMenuItem newMI, openMI, saveMI, saveAsMI, exitMI;
JMenuItem searchMI, deleteMI, updateMI, newEntryMI, sortMI;
JTextField lastName, firstName, phoneNumber;
JList<String> listView;
DefaultListModel<String> nameList = new DefaultListModel<String>();
Vector<String> numberList = new Vector<String>();
File currentFile = null;
/**
* Constructor
*/
public ContactList() {
super("Phone Contacts"); // set frame title
setLayout(new BorderLayout()); // set layout
// create menu bar
JMenuBar menubar = new JMenuBar();
setJMenuBar(menubar);
// create file menu
JMenu fileMenu = new JMenu("File");
menubar.add(fileMenu);
newMI = fileMenu.add(new JMenuItem("New"));
newMI.addActionListener(this);
openMI = fileMenu.add(new JMenuItem("Open"));
openMI.addActionListener(this);
fileMenu.addSeparator();
saveMI = fileMenu.add(new JMenuItem("Save"));
saveAsMI = fileMenu.add(new JMenuItem("Save As ..."));
fileMenu.addSeparator();
exitMI = fileMenu.add(new JMenuItem("Exit"));
exitMI.addActionListener(this);
// create edit menu
JMenu editMenu = new JMenu("Edit");
menubar.add(editMenu);
updateMI = editMenu.add(new JMenuItem("Update"));
updateMI.addActionListener(this);
newEntryMI = editMenu.add(new JMenuItem("New Entry"));
newEntryMI.addActionListener(this);
deleteMI = editMenu.add(new JMenuItem("Delete"));
deleteMI.addActionListener(this);
editMenu.addSeparator();
searchMI = editMenu.add(new JMenuItem("Search"));
searchMI.addActionListener(this);
sortMI = editMenu.add(new JMenuItem("Sort"));
sortMI.addActionListener(this);
// create phone list and controls
JPanel listPanel = new JPanel(new BorderLayout());
add(listPanel, BorderLayout.CENTER);
JLabel label = new JLabel("Name List", JLabel.LEFT);
listPanel.add(label, BorderLayout.NORTH);
listView = new JList<String>(nameList);
listView.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
listView.addListSelectionListener(this);
JScrollPane listScroller = new JScrollPane(listView);
listPanel.add(listScroller, BorderLayout.CENTER);
JPanel panel = new JPanel(new BorderLayout());
add(panel, BorderLayout.WEST);
JPanel editPanel = new JPanel(new GridLayout(6, 1));
panel.add(editPanel, BorderLayout.NORTH);
label = new JLabel("Last Name", Label.LEFT);
editPanel.add(label);
lastName = new JTextField();
editPanel.add(lastName);
label = new JLabel("First Name", Label.LEFT);
editPanel.add(label);
firstName = new JTextField();
editPanel.add(firstName);
label = new JLabel("Phone Number", Label.LEFT);
editPanel.add(label);
phoneNumber = new JTextField();
editPanel.add(phoneNumber);
}
// implementing ActionListener
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if (source == newMI) {
nameList.clear();
numberList.clear();
currentFile = null;
display(-1);
setTitle("Phone Contacts"); // reset frame title
} else if (source == openMI) {
doOpen();
} else if (source == exitMI) {
System.exit(0);
} else if (source == updateMI) {
int index = listView.getSelectedIndex();
String name = lastName.getText().trim() + " " + firstName.getText().trim();
String number = phoneNumber.getText().trim();
if (index < 0) { // add a new entry
nameList.addElement(name);
numberList.addElement(number);
index = nameList.getSize() - 1;
} else { // update an existing entry
nameList.set(index, name);
numberList.set(index, number);
}
listView.setSelectedIndex(index);
listView.ensureIndexIsVisible(index);
} else if (source == newEntryMI) {
listView.clearSelection();
display(-1);
} else if (source == deleteMI) {
int index = listView.getSelectedIndex();
nameList.remove(index);
listView.setSelectedIndex(index);
listView.ensureIndexIsVisible(index);
}
else if (source == searchMI) {
String searchName = JOptionPane.showInputDialog(this, "Please enter a name (last first) to search:");
int index = -1;
for (int i = 0; i < nameList.size(); i++) {
if (nameList.get(i).equalsIgnoreCase(searchName)) {
index = i;
}
}
if (index == -1) {
JOptionPane.showMessageDialog(this, "Name " + searchName + " does not exist in the list");
} else {
String name = nameList.elementAt(index);
int space = name.indexOf((int) ' ');
lastName.setText(name.substring(0, space));
firstName.setText(name.substring(space + 1));
phoneNumber.setText(numberList.elementAt(index));
listView.setSelectedIndex(index);
listView.ensureIndexIsVisible(index);
}
}
else if (source == sortMI) {
// created new arrayLlist to store the sorted elements
ArrayList<String> sortList = new ArrayList<String>();
for (int i = 0; i < nameList.size(); i++) {
sortList.add(nameList.getElementAt(i));
}
/* Sort statement*/
Collections.sort(nameList);
// Removed all the items from name list
nameList.removeAllElements();
// iterate through sorted list and assigned to it
for (String name : sortList) {
nameList.addElement(name);
}
listView.setSelectedIndex(0);
listView.ensureIndexIsVisible(0);
}
}
/**
* Implementing ListSelectionListener to display the selected entry
*/
public void valueChanged(ListSelectionEvent e) {
display(listView.getSelectedIndex());
}
/**
* method to specify and open a file
*/
private void doOpen() {
// display file selection dialog
JFileChooser fChooser = new JFileChooser(new File("."));
if (fChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
// Get the file name chosen by the user
currentFile = fChooser.getSelectedFile();
} else { // If user canceled file selection, return without doing
// anything.
return;
}
// Try to create a file reader from the chosen file.
FileReader reader;
try {
reader = new FileReader(currentFile);
} catch (FileNotFoundException ex) {
JOptionPane.showMessageDialog(this, "File Not Found: " + currentFile.getPath(), "Error",
JOptionPane.ERROR_MESSAGE);
doOpen();
return;
}
BufferedReader bReader = new BufferedReader(reader);
// remove items from before if any
nameList.clear();
numberList.clear();
// Try to read from the input file one line at a time.
try {
int index;
String name, number;
String textLine = bReader.readLine();
while (textLine != null) {
index = textLine.indexOf((int) ',');
if (index > 0) {
name = textLine.substring(0, index);
number = textLine.substring(index + 1);
nameList.addElement(name.trim());
numberList.addElement(number.trim());
}
textLine = bReader.readLine();
}
bReader.close();
reader.close();
} catch (IOException ioe) {
JOptionPane.showMessageDialog(this, "Error reading file: " + ioe.toString(), "Error",
JOptionPane.ERROR_MESSAGE);
return;
}
setTitle("Phone Contacts: " + currentFile.getPath()); // reset frame
//Title
listView.setSelectedIndex(0);
display(0);
}
/**
* method to display the current entry
*
*/
private void display(int index) {
if (index < 0) {
lastName.setText("");
firstName.setText("");
phoneNumber.setText("");
} else {
String name = nameList.elementAt(index);
int space = name.indexOf((int) ' ');
lastName.setText(name.substring(0, space));
firstName.setText(name.substring(space + 1));
phoneNumber.setText(numberList.elementAt(index));
}
}
/**
* the main method
*/
public static void main(String[] argv) {
// create frame
ContactList jframe = new ContactList();
Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
jframe.setSize(size.width / 2, size.height - 150);
jframe.setLocation(100, 100);
// set to terminate application on window closing
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// show the frame
jframe.setVisible(true);
}
}
Explanation / Answer
I had modified the above code and sorting is working fine...
Issues:import collections library -fixed.
sorting namelist instead of sortlist - fixed.
the above issues is fixed and now program working fine
hope this helps ... Thankyou... :)
//Modified working code.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import java.util.Vector;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class ContactList extends JFrame implements ActionListener, ListSelectionListener {
JMenuItem newMI, openMI, saveMI, saveAsMI, exitMI;
JMenuItem searchMI, deleteMI, updateMI, newEntryMI, sortMI;
JTextField lastName, firstName, phoneNumber;
JList<String> listView;
DefaultListModel<String> nameList = new DefaultListModel<String>();
Vector<String> numberList = new Vector<String>();
File currentFile = null;
/**
* Constructor
*/
public ContactList() {
super("Phone Contacts"); // set frame title
setLayout(new BorderLayout()); // set layout
// create menu bar
JMenuBar menubar = new JMenuBar();
setJMenuBar(menubar);
// create file menu
JMenu fileMenu = new JMenu("File");
menubar.add(fileMenu);
newMI = fileMenu.add(new JMenuItem("New"));
newMI.addActionListener(this);
openMI = fileMenu.add(new JMenuItem("Open"));
openMI.addActionListener(this);
fileMenu.addSeparator();
saveMI = fileMenu.add(new JMenuItem("Save"));
saveAsMI = fileMenu.add(new JMenuItem("Save As ..."));
fileMenu.addSeparator();
exitMI = fileMenu.add(new JMenuItem("Exit"));
exitMI.addActionListener(this);
// create edit menu
JMenu editMenu = new JMenu("Edit");
menubar.add(editMenu);
updateMI = editMenu.add(new JMenuItem("Update"));
updateMI.addActionListener(this);
newEntryMI = editMenu.add(new JMenuItem("New Entry"));
newEntryMI.addActionListener(this);
deleteMI = editMenu.add(new JMenuItem("Delete"));
deleteMI.addActionListener(this);
editMenu.addSeparator();
searchMI = editMenu.add(new JMenuItem("Search"));
searchMI.addActionListener(this);
sortMI = editMenu.add(new JMenuItem("Sort"));
sortMI.addActionListener(this);
// create phone list and controls
JPanel listPanel = new JPanel(new BorderLayout());
add(listPanel, BorderLayout.CENTER);
JLabel label = new JLabel("Name List", JLabel.LEFT);
listPanel.add(label, BorderLayout.NORTH);
listView = new JList<String>(nameList);
listView.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
listView.addListSelectionListener(this);
JScrollPane listScroller = new JScrollPane(listView);
listPanel.add(listScroller, BorderLayout.CENTER);
JPanel panel = new JPanel(new BorderLayout());
add(panel, BorderLayout.WEST);
JPanel editPanel = new JPanel(new GridLayout(6, 1));
panel.add(editPanel, BorderLayout.NORTH);
label = new JLabel("Last Name", Label.LEFT);
editPanel.add(label);
lastName = new JTextField();
editPanel.add(lastName);
label = new JLabel("First Name", Label.LEFT);
editPanel.add(label);
firstName = new JTextField();
editPanel.add(firstName);
label = new JLabel("Phone Number", Label.LEFT);
editPanel.add(label);
phoneNumber = new JTextField();
editPanel.add(phoneNumber);
}
// implementing ActionListener
@SuppressWarnings("unchecked")
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if (source == newMI) {
nameList.clear();
numberList.clear();
currentFile = null;
display(-1);
setTitle("Phone Contacts"); // reset frame title
} else if (source == openMI) {
doOpen();
} else if (source == exitMI) {
System.exit(0);
} else if (source == updateMI) {
int index = listView.getSelectedIndex();
String name = lastName.getText().trim() + " " + firstName.getText().trim();
String number = phoneNumber.getText().trim();
if (index < 0) { // add a new entry
nameList.addElement(name);
numberList.addElement(number);
index = nameList.getSize() - 1;
} else { // update an existing entry
nameList.set(index, name);
numberList.set(index, number);
}
listView.setSelectedIndex(index);
listView.ensureIndexIsVisible(index);
} else if (source == newEntryMI) {
listView.clearSelection();
display(-1);
} else if (source == deleteMI) {
int index = listView.getSelectedIndex();
nameList.remove(index);
listView.setSelectedIndex(index);
listView.ensureIndexIsVisible(index);
}
else if (source == searchMI) {
String searchName = JOptionPane.showInputDialog(this, "Please enter a name (last first) to search:");
int index = -1;
for (int i = 0; i < nameList.size(); i++) {
if (nameList.get(i).equalsIgnoreCase(searchName)) {
index = i;
}
}
if (index == -1) {
JOptionPane.showMessageDialog(this, "Name " + searchName + " does not exist in the list");
} else {
String name = nameList.elementAt(index);
int space = name.indexOf((int) ' ');
lastName.setText(name.substring(0, space));
firstName.setText(name.substring(space + 1));
phoneNumber.setText(numberList.elementAt(index));
listView.setSelectedIndex(index);
listView.ensureIndexIsVisible(index);
}
}
else if (source == sortMI) {
// created new arrayLlist to store the sorted elements
ArrayList<String> sortList = new ArrayList<String>();
for (int i = 0; i < nameList.size(); i++) {
sortList.add(nameList.getElementAt(i));
}
/* Sort statement*/
Collections.sort(sortList);
// Removed all the items from name list
nameList.removeAllElements();
// iterate through sorted list and assigned to it
for (String name : sortList) {
nameList.addElement(name);
}
listView.setSelectedIndex(0);
listView.ensureIndexIsVisible(0);
}
}
/**
* Implementing ListSelectionListener to display the selected entry
*/
public void valueChanged(ListSelectionEvent e) {
display(listView.getSelectedIndex());
}
/**
* method to specify and open a file
*/
private void doOpen() {
// display file selection dialog
JFileChooser fChooser = new JFileChooser(new File("."));
if (fChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
// Get the file name chosen by the user
currentFile = fChooser.getSelectedFile();
} else { // If user canceled file selection, return without doing
// anything.
return;
}
// Try to create a file reader from the chosen file.
FileReader reader;
try {
reader = new FileReader(currentFile);
} catch (FileNotFoundException ex) {
JOptionPane.showMessageDialog(this, "File Not Found: " + currentFile.getPath(), "Error",
JOptionPane.ERROR_MESSAGE);
doOpen();
return;
}
BufferedReader bReader = new BufferedReader(reader);
// remove items from before if any
nameList.clear();
numberList.clear();
// Try to read from the input file one line at a time.
try {
int index;
String name, number;
String textLine = bReader.readLine();
while (textLine != null) {
index = textLine.indexOf((int) ',');
if (index > 0) {
name = textLine.substring(0, index);
number = textLine.substring(index + 1);
nameList.addElement(name.trim());
numberList.addElement(number.trim());
}
textLine = bReader.readLine();
}
bReader.close();
reader.close();
} catch (IOException ioe) {
JOptionPane.showMessageDialog(this, "Error reading file: " + ioe.toString(), "Error",
JOptionPane.ERROR_MESSAGE);
return;
}
setTitle("Phone Contacts: " + currentFile.getPath()); // reset frame
//Title
listView.setSelectedIndex(0);
display(0);
}
/**
* method to display the current entry
*
*/
private void display(int index) {
if (index < 0) {
lastName.setText("");
firstName.setText("");
phoneNumber.setText("");
} else {
String name = nameList.elementAt(index);
int space = name.indexOf((int) ' ');
lastName.setText(name.substring(0, space));
firstName.setText(name.substring(space + 1));
phoneNumber.setText(numberList.elementAt(index));
}
}
/**
* the main method
*/
public static void main(String[] argv) {
// create frame
ContactList jframe = new ContactList();
Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
jframe.setSize(size.width / 2, size.height - 150);
jframe.setLocation(100, 100);
// set to terminate application on window closing
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// show the frame
jframe.setVisible(true);
}
}
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