try {
// Dump an empty document
PlainDocument doc = new PlainDocument();
doc.dump(System.out);
System.out.println("==========");
// Add 3 lines of text, dump again
doc.insertString(0, "Line One\n", null);
doc.insertString(doc.getLength(), "Line Two\n", null);
doc.insertString(doc.getLength(), "Line Three", null);
doc.dump(System.out);
System.out.println("==========");
// Remove "One/Line Two/Line ", dump again
doc.remove(5, 18);
doc.dump(System.out);
} catch (BadLocationException ex) {}
