Find out the text boundary with BreakIterator in Java

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.BreakIterator;
import java.util.Locale;
/*from   w w w  .  j  a va  2 s. c om*/
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new TextBoundaryFrame();
    frame.show();
  }
}

class TextBoundaryFrame extends JFrame {

  Locale[] locales;

 private BreakIterator currentBreakIterator;

 private JComboBox localeCombo = new JComboBox();

 private JTextArea inputText = new JTextArea(6, 40);

 private JCheckBox characterCheckBox = new JCheckBox("Character");

 private JCheckBox wordCheckBox = new JCheckBox("Word");

 private JCheckBox lineCheckBox = new JCheckBox("Line");

 private JCheckBox sentenceCheckBox = new JCheckBox("Sentence");
  public TextBoundaryFrame() {
    setSize(400, 400);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLayout(new FlowLayout());
    JPanel p = new JPanel();
    p.add(characterCheckBox);
    p.add(wordCheckBox);
    p.add(lineCheckBox);
    p.add(sentenceCheckBox);

    add(new JLabel("Locale"));
    add(localeCombo);
    add(p);
    add(new JScrollPane(inputText));

    locales = BreakIterator.getAvailableLocales();
    for (int i = 0; i < locales.length; i++)
      localeCombo.addItem(locales[i].getDisplayName());
    localeCombo.setSelectedItem(Locale.getDefault().getDisplayName());

    localeCombo.addActionListener(listener);

    inputText.setText("The quick, brown fox jump-ed\n"
        + "over the lazy \"dog.\" And then...what happened?");
    updateDisplay();
  }

  public void updateDisplay() {
    Locale currentLocale = locales[localeCombo.getSelectedIndex()];
    BreakIterator currentBreakIterator = null;
    currentBreakIterator = BreakIterator
        .getCharacterInstance(currentLocale);
    if (characterCheckBox.isSelected())
      currentBreakIterator = BreakIterator
          .getCharacterInstance(currentLocale);
    else if (wordCheckBox.isSelected())
      currentBreakIterator = BreakIterator.getWordInstance(currentLocale);
    else if (lineCheckBox.isSelected())
      currentBreakIterator = BreakIterator.getLineInstance(currentLocale);
    else if (sentenceCheckBox.isSelected())
      currentBreakIterator = BreakIterator
          .getSentenceInstance(currentLocale);

    String text = inputText.getText();
    currentBreakIterator.setText(text);

    int from = currentBreakIterator.first();
    int to;
    while ((to = currentBreakIterator.next()) != BreakIterator.DONE) {
      System.out.println(text.substring(from, to) + "|");
      from = to;
    }
    System.out.println(text.substring(from));
  }
  ActionListener listener = new ActionListener() {
    public void actionPerformed(ActionEvent event) {
      updateDisplay();
    }
  };
}