Invoice java

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Description

Make an Invoice class that might serve as a receipt for items sold. An Invoice should be defined by the following attributes:

  • productName : String
  • quantityPurchased : int
  • pricePerItem : double

Provide getters and setters for each attribute, making sure that the numeric values given are not negative. Set them to 0 if they are. Include a method that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as a double value. Make a test program that shows everything working.