Can't get my line shape to move when other shapes have been drawn

[kenny gill]

I'm making a drawing applet and am able to move my line shape when the button is selected, but cannot when multiple shapes have been drawn. I'm able to move all the other shapes but line will not move at all.

I can provide the class but I'll start off small with only the methods that control the move button. Also, how can I add the red to the line shape like I have with the others?

Methods:

 public void mousePressed(MouseEvent e) {
 if (model.getAction() == Model.Actions.MOVE) {
            selectedInstance = model.getSelectedInstance(e.getX(), e.getY());
            System.out.println("Selected Index :-------------  " + selectedInstance);
           
            if (selectedInstance != -1) {
                oldColor = shape.get(selectedInstance).getLineColorType();
                shape.get(selectedInstance).setLineColor(Model.MyColors.RED.toString());
                startX = shape.get(selectedInstance).getX() - e.getX();
                startY = shape.get(selectedInstance).getY() - e.getY();
                
            }
            
            if (shape.get(i) instanceof Line) {
public void mouseDragged(MouseEvent e) {
if (model.getAction() == Model.Actions.RESIZE) {
if (shape.get(i) instanceof Line) {
System.out.println("Resizing line");
((Line) shape.get(i)).setX2(e.getX());
((Line) shape.get(i)).setY2(e.getY());
} else {
shape.get(selectedInstance).setX(Math.min(startX, e.getX()));
shape.get(selectedInstance).setY(Math.min(startY, e.getY()));
 
 
shape.get(selectedInstance).setWidth(Math.abs(startX - e.getX()));
shape.get(selectedInstance).setHeight(Math.abs(startY - e.getY()));
}
}
}

   if (model.getAction() == Model.Actions.MOVE) {
                if (selectedInstance != -1) {
                    shape.get(selectedInstance).setX(e.getX() + startX);
                    shape.get(selectedInstance).setY(e.getY() + startY);
                }
               if (shape.get(i) instanceof Line) {
 
                    int diffX = e.getX() - dragStartX;
                    dragStartX = e.getX();
                    int diffY = e.getY() - dragStartY;
                    dragStartY = e.getY();
                    
                    ((Line) shape.get(i)).moveLineX(diffX);
                    ((Line) shape.get(i)).moveLineY(diffY);
                
                }
            }