Demo for three types of text component: JTextField, JPasswordField, JTextArea : TextField « Swing JFC « Java

Demo for three types of text component: JTextField, JPasswordField, JTextArea

   This program is a part of the companion code for Core Java 8th ed.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <>.

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

 * @version 1.40 2007-04-27
 * @author Cay Horstmann
public class TextComponentTest
   public static void main(String[] args)
      EventQueue.invokeLater(new Runnable()
            public void run()
               TextComponentFrame frame = new TextComponentFrame();

 * A frame with sample text components.
class TextComponentFrame extends JFrame
   public TextComponentFrame()

      final JTextField textField = new JTextField();
      final JPasswordField passwordField = new JPasswordField();

      JPanel northPanel = new JPanel();
      northPanel.setLayout(new GridLayout(2, 2));
      northPanel.add(new JLabel("User name: ", SwingConstants.RIGHT));
      northPanel.add(new JLabel("Password: ", SwingConstants.RIGHT));

      add(northPanel, BorderLayout.NORTH);

      final JTextArea textArea = new JTextArea(8, 40);
      JScrollPane scrollPane = new JScrollPane(textArea);

      add(scrollPane, BorderLayout.CENTER);

      // add button to append text into the text area

      JPanel southPanel = new JPanel();

      JButton insertButton = new JButton("Insert");
      insertButton.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent event)
               textArea.append("User name: " + textField.getText() + " Password: "
                     + new String(passwordField.getPassword()) + "\n");

      add(southPanel, BorderLayout.SOUTH);

      // add a text area with scroll bars


   public static final int DEFAULT_WIDTH = 300;
   public static final int DEFAULT_HEIGHT = 300;


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