Java Programming Tutorial - 53 - ActionListner

package apples;

import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JOptionPane;
public class apples extends JFrame {
 private JTextField item1;
 private JTextField item2;
 private JTextField item3;
 private JPasswordField passwordField;

 public apples() {
  super("The title");
  setLayout(new FlowLayout());

  item1 = new JTextField(10);
  add(item1);

  item2 = new JTextField("enter text here");
  add(item2);

  item3 = new JTextField("uneditable", 20);
  item3.setEditable(false);
  add(item3);

  passwordField = new JPasswordField("mypass");
  add(passwordField);

  thehandler handler = new thehandler();
  item1.addActionListener(handler);
  item2.addActionListener(handler);
  item3.addActionListener(handler);
  passwordField.addActionListener(handler);
 }
 private class thehandler implements ActionListener{
public void actionPerformed (ActionEvent event) {
String string = "";

if(event.getSource()==item1)
string=String.format("field 1: %s", event.getActionCommand());
else if (event.getSource()==item2)
string=String.format("field 2: %s", event.getActionCommand());
else if (event.getSource()==item3)
string=String.format("field 3: %s", event.getActionCommand());
else if(event.getSource()==passwordField)
string=String.format("password field is : %s", event.getActionCommand());

}

 }
 }