程序运行网站：

https://www.jyshare.com/compile/10/

课堂任务/课后作业：

1、阅读教材/课讲，整理笔记，弄懂当日不懂知识点；

2、

You are developing a shopping cart system and need to calculate the total price of a product. Your task is to practice the Integer and Double classes, as well as autoboxing and unboxing.Write a Java program named ShoppingCart that completes the following tasks in the main method:

Step 1: Create an Integer variable quantity with the value 5 (autoboxing)；

Create a Double variable price with the value 19.99 (autoboxing)

Step 2: Unbox quantity and price, and calculate the total price total = quantity * price.

Step 3: Use Math.round() to round the total price to two decimal places.

Step 4: Output in the following format:

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