How to auto scroll down JTextArea after append?

Question

I\'ve created a JFrame, with a JTextArea. I would like to scroll down the textarea automatically, after each append. How should I manage it?

I\'ve tried log.se

Answer 1

Mine is a little simpler and efficient. We set the caret to the length of the text to put it at the end like so.

public void appendText(String str){
    txtArea.append(str + "\n");
    scrollDown();
}

public void scrollDown(){
    txtArea.setCaretPosition(txtArea.getText().length());
}

Answer 2

there are two ways (but JTextArea must be placed in JScrollPane)

a) set Caret (correct of ways)

e.g.

  DefaultCaret caret = (DefaultCaret) log.getCaret();
  caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);

b) moving with JScrollBar (from JScrollPane) to its max value