将监听器设置为TableModel以根据需要进行更新

I am attempting to update a JTable in my GUI depending on whether a item is added or deleted. The total price in the JTextField should increment or decrement depending on the item that is removed or added. I am aware that I should use a TableModelListener to update it dynamically. I also need to set it in a total JTextField but I'm not really sure how to approach it correctly. Here is my code.I am attempting to update a JTable in my GUI de