Moving Features Between Objects: Move Method and Move Field

Lecture 17 of SE602 Software Re-Engineering investigates refactoring patterns that reallocate responsibilities between classes to achieve low coupling and high cohesion. A frequent sign of poor object-oriented design is Feature Envy, where a method in class A accesses the data and methods of class B more than its own. Students learn the step-by-step mechanics of Move Method and Move Field, relocating behavior to the class that owns the primary data. The lecture explores Extract Class, which divides a bloated class holding disparate responsibilities into two cohesive collaborators, and its inverse Inline Class. Students study Hide Delegate and Remove Middle Man, learning how to strike an optimal architectural balance between message encapsulation and excessive delegation overhead. By engaging with solved past papers by Moaaz and Waqar Siddhu, learners gain actionable insights into recurrent university exam questions. Interactive quiz assessments on VU SIGMA facilitate rapid knowledge verification and retention of critical software re-engineering concepts. Comprehensive coverage of standard academic benchmarks ensures learners communicate with technical precision across software engineering disciplines. Detailed analysis of code smell topologies highlights the imperative of eradicating duplicate logic, long methods, and bloated god classes. Test harness construction including characterization testing and regression suites are contrasted with traditional unit testing strategies. Students evaluate the trade-offs between big-bang system rewrites and progressive evolutionary refactoring in mission-critical environments. The lesson explores cognitive program comprehension models, top-down hypothesis validation, and mental mappings of complex legacy architectures. Practical code illustrations demonstrate safe code transformations, automated refactoring preconditions, and behavioral equivalence preservation. Scholars analyze Chidamber-Kemerer object-oriented metrics including WMC, CBO, and RFC to quantify the architectural impact of refactoring. Cloud migration pathways including rehosting, replatforming, and cloud-native refactoring are examined as extensions of legacy modernization. The relationship between technical debt accumulation, architectural degradation, and long-term enterprise software viability is reinforced. In this lecture, students examine formal methodologies, structural transformations, and analytical metrics of software re-engineering systems. Through detailed theoretical breakdowns, the lesson explores software evolution dynamics, legacy system preservation, and maintainability enhancement.