Esto lo consegui en el Java Almanac:
// Ensure that the cell (1,2) is visible
int rowIndex = 1;
int vColIndex = 2;
scrollToVisible(table, rowIndex, vColIndex);
// Assumes table is contained in a JScrollPane. Scrolls the
// cell (rowIndex, vColIndex) so that it is visible within the viewport.
public void scrollToVisible(JTable table, int rowIndex, int vColIndex) {
if (!(table.getParent() instanceof JViewport)) {
return;
}
JViewport viewport = (JViewport)table.getParent();
// This rectangle is relative to the table where the
// northwest corner of cell (0,0) is always (0,0).
Rectangle rect = table.getCellRect(rowIndex, vColIndex, true);
// The location of the viewport relative to the table
Point pt = viewport.getViewPosition();
// Translate the cell location so that it is relative
// to the view, assuming the northwest corner of the
// view is (0,0)
rect.setLocation(rect.x-pt.x, rect.y-pt.y);
// Scroll the area into view
viewport.scrollRectToVisible(rect);
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