1. a class that represents an invoice, the class will have two instance variables: invoice amount and invoice number. Add appropriate setters and getters.
2. a test harness class that does the following:
   1. Instantiates 1000 invoice objects, the amount of each invoice should be a random number, and the invoice number should be a unique, sequential 5-digit number starting at 10000.
   2. Store each object in an appropriate single-dimensional array.
   3. Using a separate for loop, iterate the array and print the state of any invoice in which more than $500 is owing and the invoice number is even. (print a dashed line between each object print out, and use appropriate labels for each piece of information printed.)

Your output will look something like this:

Invoice amount: $560

Invoice #: 10004

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Invoice amount: $568

Invoice #: 10014

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Invoice amount: $860

Invoice #: 10044

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