Java Basic(53)-ActionListener

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 tuna extends JFrame{

private JTextField item1;

private JTextField item2;

private JTextField item3;

private JPasswordField passwordField;

public tuna(){

super("The title");

setLayout(new FlowLayout());

item1 = new JTextField(10);

add(item1);

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

add(item2);

item3 = new JTextField("uneditable");

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());

}

}

}