Session Details

Week 2, Session 4 — Tue Mar 16

Reading

1. Big Java, §3.1–3.8
   • Pay particular attention to §3.8
   • Consider creating Wiki questions comparing Java classes to Python classes

HW Due

1. HW 3

Topics

1. Object-Oriented Encapsulation
2. Implementing Classes in Java
   • Fields, Constructors, Methods
   • Implementing an Interface
   • Documented Stubs
   • Test-first Programming, JUnit tests

Resources

1. Slides

Outline

1. [10 min] Questions
2. [5 min] OO encapsulation
3. [20 min] Java classes vs. Python classes. The BankAccount project has the code that the slides discuss.
   • Fields, Constructors, Methods
   • Overloading
   • Visibility (public, private)
   • Public Interface vs. Private Implementation
   • The this Keyword: Implicit vs. Explicit Parameters
   • Fields vs. Parameters vs. Local Variables
4. [5 min] Break
5. [20 min] Live coding on implementing a class: implement Shouter and add a test to ShouterTest in the WordGames project, as specified in the WordGames instructions.
   • Implementing an Interface
   • Using Documented Stubs
   • Test-first Programming, JUnit tests
6. [15 min] More live coding on implementing a class: implement Censor and add a test to CensorTest in the WordGames project, as specified in the WordGames instructions.
   • Fields: when you need one, how you declare one, how you initialize one
   • Constructors: writing and calling
7. [30 min] Begin homework (continue working per the WordGames instructions).

HW Assigned

1. HW 4