Show line start end offsets in a JTextArea : TextArea « Swing JFC « Java

Show line start end offsets in a JTextArea

Show line start end offsets in a JTextArea
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
//Show line start/end offsets in a JTextArea.

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.text.BadLocationException;

public class OffsetTest {
  public static void main(String[] args) {
    JTextArea ta = new JTextArea();
    JScrollPane scroll = new JScrollPane(ta);

    // Add three lines of text to the JTextArea.
    ta.append("The first line.\n");
    ta.append("Line Two!\n");
    ta.append("This is the 3rd line of this document.");

    // Print some results . . .
    try {
      for (int n = 0; n < ta.getLineCount(); n += 1)
        System.out.println("line " + n + " starts at "
            + ta.getLineStartOffset(n) + ", ends at "
            + ta.getLineEndOffset(n));

      int n = 0;
      while (true) {
        System.out.print("offset " + n + " is on ");
        System.out.println("line " + ta.getLineOfOffset(n));
        n += 13;
    } catch (BadLocationException ex) {

    // Layout . . .
    JFrame f = new JFrame();
    f.getContentPane().add(scroll, java.awt.BorderLayout.CENTER);
    f.setSize(150, 150);


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