Clean Code with Java: Learn Simple Design, Refactoring & TDD

Learn to Write Clean Code with Java. Get Hands-on with Code Examples involving 4 principles of Simple Design, Refactoring & TDD.

• Step I : Understand Clarity of Code (Unit Tests)
• Step II: Focus on 4 Principles of Simple Design
• Step III: Get started with Refactoring
• Step IV : Understand TDD

Exercises

GildedRose

• Goal
  • Understand Clarity of Code
  • Give importance to Unit Testing
• GildedRoseADefaultItemTest.java
• GildedRoseBAgedBrieTest.java
• GildedRoseCBackstagePassesTest.java
• More details - Gilded Rose Exercises

4 Principles of Simple Design

• Refactor Code
  • StudentHelper.isGradeB()
  • StudentHelper.getGrade()
  • StudentHelper.willQualifyForQuiz()
• Write Code
  • TextHelper.swapLastTwoCharacters()
  • TextHelper.truncateAInFirst2Positions()
• Refactor Unit Test
  • CustomerBOTest

Refactoring

• CustomerBOImpl.getCustomerProductsSum(List<Product>)
• Movie.isValidRating()
• MenuAccess.setAuthorizationsInEachMenus(List<MenuItem>, Role[])
• UserLoginChecker.isUserAllowedToLogin(long, String, boolean, User, List)

Try on Your Own (With Solutions)

• UserLoginCheckerTest
• MenuAccessTest

TDD

• More details - TDD Exercises
• Truncate A in first 2 positions of a String
• Check if first two and last two characters in the string are the same.
• Bowling Kata