JTextArea + position of cursor from beginning of line

Question

Hi all,
I want to find how many characters my cursor is located away from the beginning of a line, in a JTextArea.
I already know the position of the cursor using the following statement:
int caret = myJTextArea.getCaretPosition();
I also use the following method to get the line number the cursor is located (I found it in a forum posting):
public static int getLineAtCaret(JTextArea textArea)
int caretPosition = textArea.getCaretPosition();
Element root = textArea.getDocument().getDefaultRootElement();
return root.getElementIndex(caretPosition) + 1;

Answer 1

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Test extends JFrame {
    JTextArea jta = new JTextArea("Hi all,\nI want to find how many characters "+
         "my cursor is located away from the beginning of a line, in a "+
         "JTextArea.\nI already know the position of the cursor using the "+
         "following statement:\nint caret = myJTextArea.getCaretPosition();"+
         "\nI also use the following method to get the line number the "+
         "cursor is located (I found it in a forum posting):\npublic static "+
         "int getLineAtCaret(JTextArea textArea)\n{\nint caretPosition = "+
         "textArea.getCaretPosition();\nElement root = textArea."+
         "getDocument().getDefaultRootElement();\nreturn root."+
         "getElementIndex(caretPosition) + 1;\n}");
    public Test() {
     setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
     Container content = getContentPane();
     content.add(new JScrollPane(jta), BorderLayout.CENTER);
     JButton jb = new JButton("Do Not Press!!!");
     content.add(jb, BorderLayout.SOUTH);
     jb.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent ae) {
          int cpos = jta.getCaretPosition(), lpos=-1, line=-1;
          try {
              for (int x=0; x<jta.getLineCount(); x++) {
               if (jta.getLineStartOffset(x)<=cpos) {
                   line=x;
                   lpos = cpos-jta.getLineStartOffset(x);
               } else break;
              System.out.println("line="+line+", col="+lpos);
          } catch (javax.swing.text.BadLocationException ble) {
              ble.printStackTrace();
     setSize(400,300);
     show();
    public static void main( String args[] ) { new Test(); }
}