Basic Concepts

Why learning OOD?

  1. Practical problems -> Model -> Code
  2. Better understanding of OOP
  3. Code details

Key Concepts

  • Reading material

    1. "Effective Java"
    2. Java source code(e.g. ArrayList, HashMap, PriorityQueue...)

  • What is good code? What is a good design?

    (把代码当作艺术品，写代码当作雕刻一个艺术品！)

    1. Complete functionality
    2. Easy to use (by others)

      a. clear, elegant, easy to understand, no ambiguity b. prevent users from making mistakes

    3.Easy to evolve

  • Motivation of OOP

    • 1 Structured Programming: code + data

    如果一组data总是同时出现，同时总是调用一组function对这些data进行各种操作？ ArrayList： array + operations on array

    • 2 如果只想暴露有限的接口(interface, API)?

    Example: List APIs(public methods): add(E e), get(int index), remove(int index), size() Internal Implementation(private attributes, private methods): how to store elements in the list, how to track its size,...

    • 3 如果想重用部分程序，同时根据不同的情况扩展(extension)? Example:List -> ...

    • 4 如何更好的进行测试(Modular testing)?

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