HashMap 容量爲2次冪的原理

學習自 https://www.zhihu.com/question/20733617 hash static final int hash(Object key) { int h; return (key == null) ? 0 : (h = key.hashCode()) ^ (h >>> 16); } 然後 (n - 1) & hash 首先介紹(n - 1) & hash

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