Swing component blinking on upgrade

Question

I have a couple of thousand lines of code somewhere, and I noticed that my JTextPane is flickering when I update it too much. I wrote a simplified version here:

import java.awt.*;
import javax.swing.*;

public class Test
{
    static JFrame f;
    static JTextPane a;
    static final String NL = "\n";

    public static void main(String... args)
    {
        EventQueue.invokeLater(new Runnable(){
        public void run()
        {
        f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
        f.setSize(400, 300);
        f.setLocationRelativeTo(null);

        a = new JTextPane();
        f.add(new JScrollPane(a));

        new Thread(new Runnable(){
            public void run()
            {
                int i = 0;
                StringBuffer b = new StringBuffer();
                while(true)
                {
                    b.append(++i+NL);
                    a.setText(b.toString());
                    a.setCaretPosition(b.length());
                    try{Thread.sleep(10);}catch(Exception e){}
                }
            }
        }).start();
        }
        });

    }
}

This is for the terminal style GUI component (cmd) -

I think I did all the optimizations I could here, including \nas a final variable, so it won't be built hundreds of times. However, flicker is noticeable and unacceptable. After a few minutes, the component completely freezes. I have to update the component very quickly, and when updating, the panel should scroll down.

I was thinking about creating my own version of JTextPane from scratch, but I would like you to have an easier solution.

Answer 1

, Swing ! , setText() , Swing , . , setCaretPosition() . , .

. JTextPane setText() JEditorPane setCaretPosition JTextComponent, , JTextPane JavaDoc.

, setCaretPosition() , :

SwingUtilities.invokeAndWait(new Runnable() {
  public void run() {
    a.setText(b.toString());
    a.setCaretPosition(b.length());
  }
}

setCaretPosition() , setText() .

, . " " JavaDoc JTextComponent.

, :

• JTextPane ( I)
• JTextPane ( II)

Answer 2

, , insertString() Document. ; , . , .

, , , setText() , setCaretPosition(), . , ( , Swing).