/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package components;/* TextDemo.java requires no other files. */import java.awt.*;import java.awt.event.*;import javax.swing.*;public class TextDemo extends JPanel implements ActionListener {    protected JTextField textField;    protected JTextArea textArea;    private final static String newline = "\n";    public TextDemo() {        super(new GridBagLayout());        textField = new JTextField(20);        textField.addActionListener(this);        textArea = new JTextArea(5, 20);        textArea.setEditable(false);        JScrollPane scrollPane = new JScrollPane(textArea);        //Add Components to this panel.        GridBagConstraints c = new GridBagConstraints();        c.gridwidth = GridBagConstraints.REMAINDER;        c.fill = GridBagConstraints.HORIZONTAL;        add(textField, c);        c.fill = GridBagConstraints.BOTH;        c.weightx = 1.0;        c.weighty = 1.0;        add(scrollPane, c);    }    public void actionPerformed(ActionEvent evt) {        String text = textField.getText();        textArea.append(text + newline);        textField.selectAll();        //Make sure the new text is visible, even if there        //was a selection in the text area.        textArea.setCaretPosition(textArea.getDocument().getLength());    }    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event dispatch thread.     */    private static void createAndShowGUI() {        //Create and set up the window.        JFrame frame = new JFrame("TextDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Add contents to the window.        frame.add(new TextDemo());        //Display the window.        frame.pack();        frame.setVisible(true);    }    public static void main(String[] args) {        //Schedule a job for the event dispatch thread:        //creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }}