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
*/
// 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);
}
}
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