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By Steven F. Lott

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What is the distinction between an Outcome and a Bet? We need to describe the propositions on the table on which you can place bets. The propositions are distinct from an actual amount of money wagered on a proposition. There are a lot of terms to choose from, including bet, wager, proposition, place, location, or outcome. We opted for using Outcome because it seemed to express the open-ended nature of a potential outcome, different from an amount bet on a potential outcome. In a way, we’re considering the Outcome as an abstract possibility, and the Bet as a concrete action taken by a player.

For example, we might replace the String as the identification of the outcome, with a collection of the individual numbers that comprise this outcome. This would identify a straight bet by the single winning number; an even money bet would be identified by an array of the 18 winning numbers. Responsibility. he principle of isolating responsibility would be broken by this “two parallel arrays” design because now the Game class would need to know how to compute odds. In more complex games, there would be the added complication of figuring the rake.

2. Hash Equality. We can make sure that all instances of an Outcome act like they are the same object. That is, they have the same hash value and they test true for equality. They may not be two references to the same underlying object, but they pass the hash and equality tests, making them equal for all practical purposes. This allows us to create additional Outcome objects, confident they will behave appropriately. This, however, also requires that we include the odds when creating an outcome.

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Building Skills in Object-Oriented Design (with Java) by Steven F. Lott


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