The public interface of a class is cohesive if all of its features are related to the concept that the class represents. Might ChessBoard be an appropriate class? How about MovePiece? Answer: Yes (ChessBoard) and no (MovePiece).Ī class should represent a single concept. Textbook solutions Chapter 1: Objects and Classes Chapter 2: Understanding Class Definitions Chapter 3: Object Interaction Chapter 4: Grouping Objects. Your job is to write a program that plays chess. When all that is done, the draw method invokes the. The makeABid method includes the following two statements: Bid bid new Bid (bidder, value) boolean successful selectedLot.bidFor (bid) The bid variable is only used here as a placeholder for the newly created Bid object before it is passed immediately to the lot’s bidFor method. Those objects are then altered by invoking the same methods we used in the previous exercises. Exercise 1.10, 1.11, 1.12 and 1.13: N/A Exercise 1.14: The picture class’s draw method works by first creating 2 square, 1 triangle, and 1 circle objects. What is the rule of thumb for finding classes? Answer: Look for nouns in the problem description.Ħ Self Check 8.2 Answer: Yes (ChessBoard) and no (MovePiece). Change the size, color and position of the circle to create the sun.
#Bluej chapter 4 answers download
Don't turn a single operation action into a class: Paycheck is a better name than ComputePaycheck.ĥ Self Check 8.1 Answer: Look for nouns in the problem description. QUESTIONS AND ANSWERS ATOMIC STRUCTURE REVIEW Objects First With Java 5th Edition Chapter 4 Exercise May 2nd, 2018 - Read And Download Objects.
Concepts from mathematics: Point Rectangle Ellipse Concepts from real life: BankAccount CashRegisterĤ Discovering Classes Actors (end in -er, -or) - objects do some kinds of work for you: Scanner Random // Better name: RandomNumberGenerator Utility classes - no objects, only static methods and constants: Math Program starters: a class with only a main method The class name should indicate what objects of the class will do: Paycheck is a better name than PaycheckProgram. Name for a class should be a noun that describes concept.
#Bluej chapter 4 answers how to
Presentation on theme: "Chapter 8 – Designing Classes"- Presentation transcript:Ģ Chapter Goals To learn how to choose appropriate classes for a given problem To understand the concept of cohesion To minimize dependencies and side effects To learn how to find a data representation for a class To understand static methods and variables To learn about packages To learn about unit testing frameworksģ Discovering Classes A class represents a single concept from the problem domain.
0 kommentar(er)
