Quick Reference

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Note:

  • The intention of this guide is to be succinct. Don't use this for extended explanation, just note brief points. People can follow links for explanation.
  • While this guide may be useful for the exam, don't be exam specific. This is a concise list of concepts to jog your memory, not a Cheat Sheet with direct answers from last year or whatever.


Contradictory Design Maxims


Design Pattern Cliff Notes

  • Decorator
    • Identify by: Both HAS A and IS A at the same time, with multiple subclasses.
    • Used for: Adding flexible combinations of specialized functionality.
    • Classic Example: Adding scrolling functionality, borders, etc to a window.
    • Why better than alternatives: Avoids combinatorial explosion of subclasses.
  • Composite
    • Identify by: Both HAS A and IS A at the same time, usually without subclasses.
    • Used for: Making many act as one.
    • Classic Example: Making a shape comprising other shapes.
    • Why better than alternatives: Can use singular and collective instances totally transparently (identically).
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