I have to do this practical task using "switch" and/or "if, else" statements. I need some help,please.Thank you

Write a Java program to simulate an online store. The program should begin by displaying a list of products and their prices.(I did the products and prices) There should be a minimum of 4 products offered. The program should ask the user to choose a product and then ask the user to enter the quantity they require of that product. The program should then allow the user to keep choosing more products and quantities until they enter something to indicate they want to end the program (e.g. a given number or ‘q’ or ‘exit’). The program should then tell the user the total amount for the products they have selected.