[Java]如何讓JTextArea內容總顯示最後一筆[已解決]

        public void myChange(String change) {
            String tmp = jTextArea1.getText();
            tmp = tmp.concat(change + "\n\r");
            jTextArea1.setText(tmp);
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    jScrollPane1.getVerticalScrollBar().setValue(jScrollPane1.getVerticalScrollBar().getMaximum());
                }
            });
        }