Learning Java. A Test-Driven Approach 2024 (Crotts J.) (Z-Library)

【One-Line Pitch】 A second-semester Java textbook that teaches you to design methods and write JUnit tests *before* implementation, so you build correct, robust code instead of debugging by trial and error. Best for students moving from a first programming course into data structures, OOP, and algorithms. 【Book Arc】 - **Opening (~0%–10%)**: Sets the philosophy — testing from day one, a "design recipe" (data definition → signature → examples/tests → implementation) borrowed from *How to Design Programs*, plus basic Java syntax, strings, and I/O. - **Early (~10%–35%)**: Core language without objects: conditionals, recursion, loops, arrays, the Collections framework, iterators, streams, generics, and tree-based structures. This is the "foundation before objects" half. - **Middle (~35%–60%)**: Object-oriented programming arrives — classes, mutation and aliasing, interfaces, inheritance, abstract classes — followed by exceptions and file/modern I/O. - **Late (~60%–85%)**: Searching and sorting algorithms plus algorithm analysis, moving from writing code to reasoning about its cost. - **Ending (~85%–100%)**: Modern Java features such as pattern matching and concurrency, with supplemental appendices (e.g., a binary search tree library) that go beyond a typical second-semester course. 【Key Takeaways】 - **Test-driven development is the book's spine, not a side topic** (Opening): tests are written before method bodies, using JUnit's `@Test` and `assertEquals`, including a delta argument for floating-point tolerance. This reframes testing as design, not cleanup. - **Design the method before you write it** (Early): define the data, the signature, examples, and test cases first; the author argues this saves hours of debugging for minutes of preparation. - **Objects are deliberately delayed** (Middle): the first half builds fluency in syntax, recursion, and Collections; OOP, inheritance, and interfaces come after the midpoint to keep emphasis on testing and data structures. - **Java's type system has sharp edges** (Middle): integer division truncates (`5 / 9` yields `0`), so floating-point operands and parentheses matter; the `var` keyword (Java 10) infers types. - **The Collections framework and generics are treated as core literacy** (Early): arrays, collections, iterators, streams, and type parameters form the bridge to real data structures. - **The curriculum extends past the basics** (Late/Ending): searching, sorting, algorithm analysis, pattern matching, and concurrency are included, with appendices for extra structures. - **The book is classroom-tested** (Early): piloted in Indiana University's CSCI-C 212, with student feedback incorporated — it reads as a course companion, not an abstract reference. 【Reading Tips】 - **Deep-read the opening chapters even if you know Java syntax** — the design recipe and JUnit workflow are the book's real payload and recur throughout. - **Type out every code listing and test**; the author explicitly warns against skimming examples, and code is laid out to fit single pages where possible. - **Expect to revisit chapters**: the preface states a page, example, or chapter may need multiple passes to digest. - **Skim if you already know OOP** (Middle) but slow down on generics, streams, and algorithm analysis, which are where second-semester students typically struggle. - **Use the exercises**: each chapter ends with problem sets, and the book is built around practice and remediation rather than passive reading. 【Coverage Limits】 The excerpts cover the preface, table of contents, and early chapters in detail; later chapters (searching/sorting, algorithm analysis, modern features, appendices) are only visible through headings, so this guide cannot describe their specific content.