//editor is jtextarea

Rectangle r = editor.getVisibleRect();
Point top = new Point(r.x, r.y);
Point bottom = new Point(r.x, r.y + r.height);
int startRow = editor.viewToModel(top); // this is working. it shows 0 at initial, then after the line reaches the end and when the scrollbar gets displayed, it shows the numbers correctly, 1,2,3...
int endRow = editor.viewToModel(bottom); // this is not working, when we type, it is taking column numbers
editorLineNo.setText(" START ROW " + startRow + " END ROW" + endRow);

What is needed is, start row number and end row number from the jtextarea