Java Programming Tutorial - 54 - Event Handler Program

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());

 

JOptionPane.showMessageDialog(null, string);

 

}

 }

 }

package apples;

import javax.swing.JFrame; 

public class boy {

public static void main (String []args) {

apples thileban = new apples();

thileban.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

thileban.setSize(350,100);

thileban.setVisible(true);

}

}