1. Complete the implementation for the Delete menu item in the Edit menu. When D

Question

1. Complete the implementation for the Delete menu item in the Edit menu. When Delete is
selected, the currently displayed list entry should be deleted from the list. The entry
preceding or the one following the deleted entry should become the new current entry.

2. Complete the implementation for the Search menu item in the Edit menu. When Search is
selected, a dialog window should appear to request for a name to be searched. If the name
specified is found in the list, the entry should be selected and the phone number displayed.
Otherwise, a message window should be presented to acknowledge that the name does not
exist in the list.

3. 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.

Explanation / Answer

Below is your code

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));

}

// sorted using Collection.sort

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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