How to ask if selected row in JTable is visible?

I have this function

private static void autoScrollToRow(JTable table) {
	  JViewport viewport = (JViewport) table.getParent();
	    Rectangle cellRectangle = table.getCellRect(table.getSelectedRow(), 0, true);
	    Rectangle visibleRectangle = viewport.getVisibleRect();
	    table.scrollRectToVisible(new Rectangle(cellRectangle.x, cellRectangle.y, (int) visibleRectangle.getWidth(), (int) visibleRectangle.getHeight()));
}

and this function scrolls in that way that currently selected row is first in tableView. How to edit this function so it only do scrolling if selected row is out of sight?
(Something like if(table.sellectedRowVisibleOnScreen(true)))

You already have two Rectangles in your method that you can test.

private static void autoScrollToRow(JTable table) {
    JViewport viewport = (JViewport) table.getParent();
    Rectangle cellRectangle = table.getCellRect(table.getSelectedRow(), 0, true);
    Rectangle visibleRectangle = viewport.getVisibleRect();
    
    if (!visibleRectangle.contains(cellRectangle)) {
        int width = (int) visibleRectangle.getWidth();
        int height = (int) visibleRectangle.getHeight();
        table.scrollRectToVisible(new Rectangle(
                cellRectangle.x, cellRectangle.y, width, height));
    }
}

> How to edit this function so it only do scrolling if selected row is out of sight?

You don't do anything special.

This is the default behavior of the scrollToRect(...) method (as I explained in my comment).

All you need in your method is:

Rectangle cellRectangle = table.getCellRect(table.getSelectedRow(), 0, true);
table.scrollRectToVisible(cellRectangle);

1. If the selected row is above the top of the viewport, the viewport will be scrolled so the row is at the top.
2. If the selected row is below the viewport the viewport, will be scrolled so the row is at the bottom.
3. If the selected row is already visible in the viewport, no scrolling is done.