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                ### 迭代器 定義:迭代器(Iterator)是一個對象,允許用戶每次獲取和使用集合中的一個元素; ### API * Iterator:用于定義一個對象作為一個迭代器; * Iterable:用于定義一個集合,從該集合中可以抽取一個迭代器; ### 及時失敗 當使用迭代器迭代容器類時,如果有其它線程對容器類進行修改,就會拋出ConcurrentModificationException異常,這種處理方式就是“及時失敗(fail-fast)”
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