Design and implement (in Java) a program that simulates a vending machine. Products can be purchased by inserting the correct number of coins into the machine. A user selects a product from a list of available products, adds coins, and either gets the product or gets the coins returned if insufficient money was supplied or if the product is sold out. Products can be restocked and money removed by an operator..

Remaining 50% is based on the elegance of your design with respect to classes and their interactions. I'll be evaluating this based on the code itself (not asking for any other class documentation such as CRC cards, etc.), but you're more likely to arrive at a good class design if you follow the process.