軟體設計精要與模式--筆記1
阿新 • • 發佈：2019-02-18
一：面向物件的核心要素
封裝（Encapsulation）、繼承（Inheritance）、多型（Polymorphism）
1.封裝
封裝就是合理的隱藏和公開。
In computer science, information hiding is the principle of segregation of the
design decisions in a computer program that are most likely to change, thus
protecting other parts of the program from extensive modification if the design
decision is changed. The protection involves providing a stable interface which
protects the remainder of the program from the implementation (the details that
are most likely to change).
這是維基百科的解釋，簡單點說就是將最可能發生變化的隱藏起來，公開物件呼叫者需要
的介面。
例：員工（Employee）的年齡（Age）。顯然Age應該作為屬性，而不是作為欄位直接暴露給
呼叫者。
封裝（Encapsulation）、繼承（Inheritance）、多型（Polymorphism）
1.封裝
封裝就是合理的隱藏和公開。
In computer science, information hiding is the principle of segregation of the
design decisions in a computer program that are most likely to change, thus
protecting other parts of the program from extensive modification if the design
decision is changed. The protection involves providing a stable interface which
protects the remainder of the program from the implementation (the details that
are most likely to change).
這是維基百科的解釋，簡單點說就是將最可能發生變化的隱藏起來，公開物件呼叫者需要
的介面。
例：員工（Employee）的年齡（Age）。顯然Age應該作為屬性，而不是作為欄位直接暴露給
呼叫者。