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The “Simple Dot Com Game”
Goal: Sink all of the computer’s Dot Coms in the fewest number of guesses. You’re given a taring of level, based on how well you perform.
Setup: When the game program is launched, the computer places three Dot Coms on a virtual 7x7 grid. When that’s complete, the game asks for your first guess.
How you play: The computer will prompt the user to enter a guess. In response to the guess you’ll see a response at the command line: “Hit”, “Miss”, or “You sunk Pets.com” (or whatever the name of the company was). When all companies are sunk the game ends by reporting your rating.
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A High-Level Design
See you textbooks on page 97.
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The Three Things!PREP CODE TEST CODE REAL CODE
Prep code: A form of pseudocode, to help you focus on the logic without stressing about syntax.
Test code: A class or methods that will test the real code and validate that it’s doing that right thing.
Real code: The actual implementation of the class. This is where you put the real Java code.
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Prep Code
Most prepcode includes three parts: Instance variable declarations
Method declarations
Method logicSimpleDotCo
mint[] locationCellsint numOfHits
String checkYourself(String guess)
void setLocationCells(int[] loc)
Let’s give it a try!
PR
EP
CO
DE
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Test Code
Based on our prep code what should we test?
The concept of writing the test code first is one of the practices of Extreme Programming (XP), and it can make it easier (and faster) for you to write your code.
TES
T C
OD
E
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Test Code for the SimpleDotCom Class
TES
T C
OD
E
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The checkYourself() Method
REA
L C
OD
E
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Final code for SimpleDotCom and SimpleDotComTestDrive
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Let’s Finish Our SimpleDotComGame Class
Check out the prep code on page 108.
Check out the main() method on page 110.
Let’s Play!
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More about for loops!
for (int i = 0; i < 100; i++) { }
Part One: initialization
Part Two: boolean test
Part Three: iteration expression
Take a trip through a for() loop on page 115.
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Difference Between While and For
The while loop has only the Boolean test; it doesn’t have a built-in initialization or iteration expression.
A while loop is good when you don’t know how many times to loop and just want to keep going while some condition is true.
But, if you know how many times to loop a for loop is cleaner.
Let’s compare the two types of loops.
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The Enhanced For Loop!
for (String name : nameArray) { }Part One: initialization variable declaration
Part Two: the actual collection
Let’s look at an example!
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Casting PrimitivesI have already gone over this concept in class, but read page 117 in your textbook for a more in-depth explanation.
long
bytecan be
cast to