Swing JTextArea

Question

Hi,
Ok so previously I used TextArea in my application...
TextArea ta = new TextArea();
so normally i would update the textarea...
ta.append("with some string");
Now the textarea in java.awt normally has scrollbars
and would display the most recent text!
How do I go about achieving the same effect with JTextArea?
Do I have to use the the JScrollbar?
Any help much appreciated!

Answer 1

Hello,
first sorry for my slightly rude posting but its difficult to guess where problems are without code snippets and sixth sense.
Try SwingUtilities [url http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html#invokeLater]invokeLater :import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Temp extends JFrame
     Temp()
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          final JTextArea text = new JTextArea();
          final JScrollPane scroll = new JScrollPane(text);
          scroll.setPreferredSize(new Dimension(300,300));
          getContentPane().add(scroll);
          JButton addGarbage = new JButton("add some garbage");
          addGarbage.addActionListener(new ActionListener()
               public void actionPerformed(ActionEvent e)
                    text.append("SomeGarbageSomeGarbageSomeGarbageSomeGarbageSomeGarbageSomeGarbageSomeGarbageSomeGarbage\n");
                    SwingUtilities.invokeLater(new Runnable(){
                         public void run(){
                         JScrollBar horBar = scroll.getHorizontalScrollBar();
                         horBar.setValue(horBar.getMaximum());
          getContentPane().add(addGarbage, BorderLayout.SOUTH);
          pack();
          setLocationRelativeTo(null);
          setVisible(true);
     public static void main(String[] args){new Temp();}
}I think you had a problem with your horizontal scrollbar because it alway jumps to the left.
regards,
Tim