OffsetTest.java Source code

Introduction

Here is the source code for OffsetTest.java

Source

/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/
// OffsetTest.java
//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();
        ta.setLineWrap(true);
        ta.setWrapStyleWord(true);
        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));
            System.out.println();

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

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