今日课程：

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The improved code uses private instance variables (price, discount, productName)  for better encapsulation, preventing direct access and modification from outside the class.  It also introduces getter methods (like getProductName()) for controlled access to the instance variables.  The names of the methods have been made more descriptive (e.g., return_product changed to returnProduct).  Finally, a default discount of 0 is set in the constructor that takes only the product name and price.  This makes the code more robust and easier to understand and maintain.
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