讲真，“Array、ArrayList、LinkedList 长度到底能不能变”这个问题，我在面试里被问过，在 code review 里被怼过，也亲手在线上代码里踩过坑。很多新手以为 ArrayList 能 add 就是可变长度，数组用不了就固定长度，LinkedList 也是可变——但对了一半。真正要搞明白的是“长度可变”背后的实现机制，以及这 ...

// Most asked problems at FAANG companies: https://docs.google.com/spreadsheets/d/1hzP8j7matoUiJ15N-RhsL5Dmig8_E3aP/edit#gid=1377915986 ...

An array in Java is a container object that holds a fixed number of values of a single type. The length of an array is established when the array is created and cannot be changed.

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