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                ### 迭代器模式 提供一種方法順序訪問一個聚合對象中各個元素,而又不暴露該對象的內部表示。(摘抄) 當你需要遍歷一個聚集對象的時候應該考慮迭代器模式,其原理也就是把一個聚集對象從頭到尾走一遍,現在大多數語言都進行了封裝,所以其實不需要過多講解 ~~~ for (iterable_type iterable_element : iterable) { } ~~~
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