Question

I get Document object from JTextPane, which contains method remove, but specific number of chars textPane.getDocument().remove(begin,end). I would like to remove whole first line.

Answer 1

The following shows how to remove the first line (Element) of a JTextPane if you are considering lines “things that end in a newline”. If you have fancier content in your Document, you may need to do something more elaborate

JTextPane pane = new JTextPane();
pane.setText("I've got to go\nI can stay, though.\nThree lines of text?");
System.out.println(pane.getText());

System.out.println("\n\n\n removing! \n\n\n");
Element root = pane.getDocument().getDefaultRootElement();
Element first = root.getElement(0);
pane.getDocument().remove(first.getStartOffset(), first.getEndOffset());
System.out.println(pane.getText());