import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class Main {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTable t = new JTable(10, 1);
frame.add(new JScrollPane(t));
t.getSelectionModel().clearSelection();
t.getSelectionModel().addSelectionInterval(5, 6);
t.getSelectionModel().addSelectionInterval(8, 8);
frame.pack();
frame.setVisible(true);
}
}