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

By Steven F. Lott

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We prefer not to decompose an object into separate data elements. If we do decompose this object, we will have to ask which class would own these two arrays? If Wheel keeps these, then Table becomes very tightly coupled to these two arrays that should be Wheel ‘s responsibility. If Table keeps these, then Wheel is priviledged to know details of how Table is 38 Chapter 4. 1-Java implemented. If we need to change these arrays to another storage structure, two classes would change instead of one. Having the name and odds in a single Outcome object allows us to change the representation of an Outcome.

Format( msgTempl, values ); } 1. Create an array of objects that will be converted to Strings and inserted into the message. 2. Create the template message. 3. Insert the objects into the template message, returning the new String. 46 Chapter 5. Outcome Class CHAPTER SIX BIN CLASS This chapter will present the design for the Bin class. In addition to that, we’ll examine the collection classes available in Java and Python. We’ll also present present some questions and answers on this particular class and the process of creating a design.

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.

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