Java Swing Tutorials - Herong's Tutorial Examples - v4.32, by Herong Yang
AWT TextField and ActionListener
This section provides a tutorial example on how to create an AWT text field with an event handler implemented as the ActionListener listener.
AWT TextField component can trigger ActionEvent directly. Here is a sample program to show you how TextField ActionEvent works:
/* TextFieldTest.java
* Copyright (c) 1997-2024 HerongYang.com. All Rights Reserved.
*/
import java.awt.Frame;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class TextFieldTest {
public static void main(String[] a) {
Frame f = new Frame("Text Field Test");
MyTextField t = new MyTextField(16);
f.add(t);
f.pack();
f.setVisible(true);
}
private static class MyTextField extends TextField
implements ActionListener {
static int count = 0;
public MyTextField(int l) {
super(l);
addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
count++;
System.out.println(count+": Action performed - "+getText());
}
}
}
Run this program and do the following in the text field:
- Type "Hello".
- Press the enter key.
- Type " World!".
- Press the enter key.
The text field should look like this:
And you should get the following output in the console window:
1: Action performed - Hello 2: Action performed - Hello World!
The output confirms that:
- ActionListener is called when the enter key is pressed.
Table of Contents
Introduction of Java Swing Package
Graphics Environment of the Local System
JCheckBox - Swing Check Box Class
JRadioButton - Swing Radio Button Class
JTextField - Swing Text Field Class
JComboBox - Swing Combo Box Class
Menu Bar, Menus, Menu Items and Listeners
Creating Internal Frames inside the Main Frame
Layout of Components in a Container
JEditorPane - The Editor Pane Class
SwingWorker - The Background Task Worker
►AWT (Abstract Windows Toolkit)
What Is AWT (Abstract Windows Toolkit)
HelloAWT.java - My First AWT Program
Closing AWT Frame and Terminating Application
Drawing Graphics - Using paint() on Frame or Component
Creating Labels with java.awt.Label Class
Creating Buttons with java.awt.Button Class
AWT Button Action Handler at the Component Level
AWT Button Action Handler at the Frame Level
AWT Button Mouse Click Handler at the Frame Level
►AWT TextField and ActionListener
MenuBarTest.java - AWT Menu Bar Test Program
MenuTest.java - AWT Menu Test Program
MenuItemTest.java - AWT Menu Item Test Program
MenuItemActionListenerTest.java - AWT Menu Item Action Listener