Effective Java Item31 - 利用限制通配符來提昇API靈活性 · jyt0532's Blog



Effective Java Item31 - 利用限制通配符來提昇API靈活性 · jyt0532's Blog

這篇是Effective Java - Use bounded wildcards to increase API flexibility章節的讀書筆記 本篇的程式碼來自於原書內容

本篇是泛型系列文的高潮 請讀者務必要讀懂這篇的內容

本章節可以搭配

泛型篇章簡介及術語列表

類型參數和通配符的選擇

到底 <T extends Comparable<? super T»是什麼意思

服用

Item31: 利用限制通配符來提昇API靈活性

我們在Item28有說 泛型是不可變(invariant) 意思是說 對於任意兩種不同的type Type1和Type2 , List<Type1> 既不是List<Type2>的子類型 也不是它的父類型


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