public void actionPerformed(ActionEvent e) {
gui.setText("");
String name = JOptionPane.showInputDialog("Enter Name");
if (name != null) {
if (phoneBook.remove(name)) {
gui.setText("Success! " + name + " removed.");
} else {
gui.setText("Failure! " + name + " not found!");
}
} else {
gui.setText("");
}
}