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import java.awt.Rectangle;
import javax.swing.JTable;
import javax.swing.JViewport;
public class Main {
public static void main(String[] argv) throws Exception {
JTable table = new JTable(5, 5);
int rowIndex = 1;
int vColIndex = 2;
scrollToCenter(table, rowIndex, vColIndex);
}
public static void scrollToCenter(JTable table, int rowIndex, int vColIndex) {
if (!(table.getParent() instanceof JViewport)) {
return;
}
JViewport viewport = (JViewport) table.getParent();
Rectangle rect = table.getCellRect(rowIndex, vColIndex, true);
Rectangle viewRect = viewport.getViewRect();
rect.setLocation(rect.x - viewRect.x, rect.y - viewRect.y);
int centerX = (viewRect.width - rect.width) / 2;
int centerY = (viewRect.height - rect.height) / 2;
if (rect.x < centerX) {
centerX = -centerX;
}
if (rect.y < centerY) {
centerY = -centerY;
}
rect.translate(centerX, centerY);
viewport.scrollRectToVisible(rect);
}
}
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