Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.info office: 14 -227 CSC 305 Individual Software Design and Development Lecture 03. Clean Coding II

Previously

Week 01 3 ✅ Clean Code

Week 01 4

Week 01 • SRP : Each class should have one, and only one, clear, well-defined job. • Break down your code into smaller, reusable functions. • Keep functions focused on a single task. • Use comments wisely (JavaDoc, multi-line, single-line) • DRY • KIS 5

Review Lab 01: Tic Tac Toe 6 Main Or Driver Player GameEngine GameBoard

Review Lab 01: Tic Tac Toe 7 Driver Player Game public class Driver { public static void main(String[] arg) { Player player = new Player(); GameEngine game = new GameEngine(); game.ready(); do { player.move(); game.move(); } while (!game.isOver()); game.bye(); } } GameEngine GameBoard Main Or Driver

One more thing: Dependency Injection

Dependency Injection 9

Dependency Injection (DI) • An object’s dependencies (other objects it relies on) are provided externally rather than created internally by the object itself. • Constructor injection: Dependencies are passed via the class constructor. • Setter injection: Dependencies are provided through setter methods. • Make components more accessible to swap or extend without modifying the dependent class. 10

• Body Level One • Body Level Two • Body Level Three • Body Level Four • Body Level Five "

Tic Tac Toe 12 Main Player Game View

Dependency Injection 13 public class Driver { public static void main(String[] arg) { View view = new View (); Player player = new Player(view); Game game = new Game(view); game.ready(); do { player.move(); game.move(); } while (!game.isOver()); game.bye(); } }

Dependency Injection 14 public class Driver { public static void main(String[] arg) { View view = new View (); Player player = new Player(view); Game game = new Game(view); game.ready(); do { player.move(); game.move(); } while (!game.isOver()); game.bye(); } } public class View { public void print(String s) { System.out.println(s); } } public class Game { View myView; public Game(View v) { myView = v; } public void ready() { myView.print (“Welcome!”); } // more code … }

Examples

Jsoup Example 16

Jsoup Example 17 https://github.com/CSC3100/Tool-Maven

JFreeChart Example 18

JFreeChart Example 19 https://github.com/CSC3100/Tool-Maven

JavaParser Example 20

JavaParser Example 21 https://github.com/CSC3100/Tool-Maven

Weka Example 22 data

Weka Example 23 (4)

Weka Example 24 https://github.com/CSC3100/Tool-Maven

115,475 Towns and Cities in the United States July, 2012 https://www.math.uwaterloo.ca/tsp/data/usa/index.html Weka Example 25

Tools 26

Questions 27

Lab 03

CSC 305 Individual Software Design and Development Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Winter 2025 Copyright. These slides can only be used as study material for the class CSC305 at Cal Poly. They cannot be distributed or used for another purpose.