Irving_Ma的博客

HashMap为什么最大容量是1<<30 描述 源码： /** * The maximum capacity, used if a higher value is implicitly specified * by either of the constructors with arguments. * MUST be a power of two <= 1&...

# HashMap初始容量为什么必须是2的幂次方？ ```java /** * The default initial capacity - MUST be a power of two. */ static final int DEFAULT_INITIAL_CAPACITY = 1 << 4; // aka 16 ``` ### 关键词 1. hash碰撞 2....