JTable multiple interval selection behavior

Question

How do you force a JTable to behave as if the control key is always pressed, without the user actually holding down the control key?
My desired result is to have the user be able to select multiple independent intervals, exactly like the behavior when the ctrl key is held down. But I do not want the selection cleared like when the ctrl key is released and a new interval is selected.

Answer 1

I solved my problem by subclassing JTable to invert the toggle parameter sent by BasicTableUI.java in the event that control is depressed while making a selection.
Now instead of using javax.swing.JTable I will use my Toggle inverted version below.
import javax.swing.JTable;
public class JTableToggle extends javax.swing.JTable {
    public JTableToggle(){
        super();
    public void changeSelection(int rowIndex, int columnIndex, boolean toggle, boolean extend) {
        // toggle is true in the case where the control key is pressed, i will invert that case.
        toggle = !toggle;
        super.changeSelection(rowIndex,columnIndex,toggle,extend);
}