ArrayList is a dynamic array. In other words, you don't need to specify the size at the beginning, you can store values one after another as you go.
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The only string in the list is "Java". If you search for "PHP" from here, the return value is null. The original code for this exercise returns null only when nothing is found. What the caller wants ...
在 Java 开发中，数组（Array）和 ArrayList 是最常用的两种数据存储结构。虽然它们都用于存储元素集合，但在底层实现、功能特性、性能表现以及适用场景上存在显著差异。
本内容遵循CC 4.0 BY-SA版权协议 本文深入剖析ArrayList作为动态顺序表的底层实现，涵盖顺序表特性、随机访问与增删效率对比、泛型设计与接口实现；重点解析其1.5倍扩容机制（非2倍）、源码级 ...
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