Java JPanel questions

How do you draw multiple line and square in one JPanel?

how do you keep track on that x and y value (Starting x and y value, end x and y value) when the mouse listener get call every time?

and how do you make this class implement an action listener. Please if you could explain to me what to do in the code.

In the code it should be able to draw multiple line and square with any size that mouselistener get from user, also it has to have one reset button that clear everything in jpanel.

they said have to override the paintComponent() but how do i do that? can you please give example either square or line.