TextArea 2

[steve981]

If i have 5 lines in a TextArea, how can i access only the third line?, i searched a lot but the nearest thing i found is getText(), but that gives me all the text.

 

[prosper]

//If you use JTextare in Swing, you can select the third line

import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
class jt extends JFrame
      {
       public jt()
              {
               super("jt");
               JPanel p = new JPanel(new BorderLayout());
               JTextArea chatText = new JTextArea("one\ntwo\nthree",10, 30);
               chatText.setLineWrap(true);
               chatText.setEditable(true);
               //chatText.setForeground(Color.white);
               //chatText.setBackground(new Color(80,0,0));

               JScrollPane chatTextPane = new JScrollPane();
               chatTextPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER );
               chatTextPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
               JViewport vp = chatTextPane.getViewport(); 
               vp.add(chatText); 
               p.add(chatTextPane, BorderLayout.CENTER);
               getContentPane().add(p,BorderLayout.CENTER);
try {
System.out.println(chatText.getLineStartOffset(2));
System.out.println(chatText.getLineEndOffset(2));
System.out.println( (chatText.getText()).substring(chatText.getLineStartOffset(2),chatText.getLineEndOffset(2)) );
    }
catch (BadLocationException be)
      {System.out.println("invalid line no");}
              }
       public boolean isManagingFocus() // all your JComponents should have this method overidden like this if you want to manage focus yourself
              {
               return true;
              }
       public static void main(String args[])
              {
               jt jtObj = new jt();
               jtObj.setSize(400,400);
               jtObj.setVisible(true);
              }
      }

 

[Bong]

Or you could "getText()" the whole area and tokenize on "\n".

Bob Rashkin
rrashkin@csc.com

 

[prosper]

two "\n" are needed to identify three lines, so the default text in the JTextArea in my program code also needs to contain "\n".
If the width of the JTextArea is so small that the line number will seem to be greater.