Source Code : This program demonstrates a simple fixed list of strings

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This program demonstrates a simple fixed list of strings

 
/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)

   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
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   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 <http://www.gnu.org/licenses/>.
*/

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

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

/**
 * This program demonstrates a simple fixed list of strings.
 * @version 1.23 2007-08-01
 * @author Cay Horstmann
 */
public class ListTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(new Runnable()
         {
            public void run()
            {
               JFrame frame = new ListFrame();
               frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               frame.setVisible(true);
            }
         });
   }
}

/**
 * This frame contains a word list and a label that shows a sentence made up from the chosen words.
 * Note that you can select multiple words with Ctrl+click and Shift+click.
 */
class ListFrame extends JFrame
{
   public ListFrame()
   {
      setTitle("ListTest");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      String[] words = { "quick", "brown", "hungry", "wild", "silent", "huge", "private",
            "abstract", "static", "final" };

      wordList = new JList(words);
      wordList.setVisibleRowCount(4);
      JScrollPane scrollPane = new JScrollPane(wordList);

      listPanel = new JPanel();
      listPanel.add(scrollPane);
      wordList.addListSelectionListener(new ListSelectionListener()
         {
            public void valueChanged(ListSelectionEvent event)
            {
               Object[] values = wordList.getSelectedValues();

               StringBuilder text = new StringBuilder(prefix);
               for (int i = 0; i < values.length; i++)
               {
                  String word = (String) values[i];
                  text.append(word);
                  text.append(" ");
               }
               text.append(suffix);

               label.setText(text.toString());
            }
         });

      buttonPanel = new JPanel();
      group = new ButtonGroup();
      makeButton("Vertical", JList.VERTICAL);
      makeButton("Vertical Wrap", JList.VERTICAL_WRAP);
      makeButton("Horizontal Wrap", JList.HORIZONTAL_WRAP);

      add(listPanel, BorderLayout.NORTH);
      label = new JLabel(prefix + suffix);
      add(label, BorderLayout.CENTER);
      add(buttonPanel, BorderLayout.SOUTH);
   }

   /**
    * Makes a radio button to set the layout orientation.
    * @param label the button label
    * @param orientation the orientation for the list
    */
   private void makeButton(String label, final int orientation)
   {
      JRadioButton button = new JRadioButton(label);
      buttonPanel.add(button);
      if (group.getButtonCount() == 0) button.setSelected(true);
      group.add(button);
      button.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               wordList.setLayoutOrientation(orientation);
               listPanel.revalidate();
            }
         });
   }

   private static final int DEFAULT_WIDTH = 400;
   private static final int DEFAULT_HEIGHT = 300;
   private JPanel listPanel;
   private JList wordList;
   private JLabel label;
   private JPanel buttonPanel;
   private ButtonGroup group;
   private String prefix = "The ";
   private String suffix = "fox jumps over the lazy dog.";
}

   
  

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