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About this course
Structural patterns are about composition: how you put objects together so that a system stays changeable. They are the patterns most often confused with one another, because several of them have nearly identical class diagrams and differ only in intent — a Proxy and a Decorator can look the same on paper and mean opposite things. This course drills that distinction as practice questions rather than a catalogue, because intent is what interviews and code reviews test.
What it covers
Eight topics: Adapter, Decorator, Facade, Proxy, Composite, Bridge, and Flyweight — each split into basics, implementation or variants, and the tradeoffs that decide whether to reach for it — then a mastery topic on comparing the patterns, selecting between them, and recognising them in real systems.
Who this is for
Developers preparing for design and code-review rounds, and anyone who can name these patterns but hesitates when asked how Bridge differs from Adapter, or why Flyweight exists at all. It assumes comfort with classes, interfaces, inheritance, and composition in an object-oriented language, and ideally a pass over the creational patterns first.
How MCQ practice works on Abekus
The course is organised as topics, subtopics, and individual lessons. Each lesson pairs a short set of explanation cards with practice questions written for that lesson, so the questions test the idea you just read rather than a general survey. Wrong answers come with a worked explanation, and the AI guide surfaces the mistakes you keep repeating.