collationtest.java

这个是我老师给的关于Java核心技术2的第10章的源代码。可以看看。

/**
   @version 1.12 2004-09-15
   @author Cay Horstmann
*/

import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;
import java.util.List;
import javax.swing.*;

/**
   This program demonstrates collating strings under
   various locales.
*/
public class CollationTest
{
   public static void main(String[] args)
   {
      JFrame frame = new CollationFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }
}

/**
   This frame contains combo boxes to pick a locale, collation
   strength and decomposition rules, a text field and button
   to add new strings, and a text area to list the collated
   strings.
*/
class CollationFrame extends JFrame
{
   public CollationFrame()
   {
      setTitle("CollationTest");

      setLayout(new GridBagLayout());
      add(new JLabel("Locale"), new GBC(0, 0).setAnchor(GBC.EAST));
      add(new JLabel("Strength"), new GBC(0, 1).setAnchor(GBC.EAST));
      add(new JLabel("Decomposition"), new GBC(0, 2).setAnchor(GBC.EAST));
      add(addButton, new GBC(0, 3).setAnchor(GBC.EAST));
      add(localeCombo, new GBC(1, 0).setAnchor(GBC.WEST));
      add(strengthCombo, new GBC(1, 1).setAnchor(GBC.WEST));
      add(decompositionCombo, new GBC(1, 2).setAnchor(GBC.WEST));
      add(newWord, new GBC(1, 3).setFill(GBC.HORIZONTAL));
      add(new JScrollPane(sortedWords), new GBC(1, 4).setFill(GBC.BOTH));

      strings.add("America");
      strings.add("ant");
      strings.add("Zulu");
      strings.add("zebra");
      strings.add("\u00C5ngstr\u00F6m");
      strings.add("Angstrom");
      strings.add("Ant");
      updateDisplay();

      addButton.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               strings.add(newWord.getText());
               updateDisplay();
            }
         });

      ActionListener listener = new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event) { updateDisplay(); }
         };

      localeCombo.addActionListener(listener);
      strengthCombo.addActionListener(listener);
      decompositionCombo.addActionListener(listener);
      pack();
   }
   /**
      Updates the display and collates the strings according
      to the user settings.
   */
   public void updateDisplay()
   {
      Locale currentLocale = (Locale) localeCombo.getSelectedItem();
      localeCombo.setLocale(currentLocale);

      currentCollator = Collator.getInstance(currentLocale);
      currentCollator.setStrength(strengthCombo.getValue());
      currentCollator.setDecomposition(decompositionCombo.getValue());

      Collections.sort(strings, currentCollator);

      sortedWords.setText("");
      for (int i = 0; i < strings.size(); i++)
      {
         String s = strings.get(i);
         if (i > 0 && currentCollator.compare(s, strings.get(i - 1)) == 0)
            sortedWords.append("= ");
         sortedWords.append(s + "\n");
      }
      pack();
   }

   private Locale[] locales;
   private List<String> strings = new ArrayList<String>();
   private Collator currentCollator;
   private JComboBox localeCombo = new LocaleCombo(Collator.getAvailableLocales());

   private EnumCombo strengthCombo = new EnumCombo(Collator.class,
      new String[] { "Primary", "Secondary", "Tertiary" });
   private EnumCombo decompositionCombo = new EnumCombo(Collator.class,
      new String[] { "Canonical Decomposition", "Full Decomposition", "No Decomposition" });
   private JTextField newWord = new JTextField(20);
   private JTextArea sortedWords = new JTextArea(10, 20);
   private JButton addButton = new JButton("Add");
}