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3.15 常见Collections
3.15.1 Vector(向量)
3.15.2 String(字符串)
3.15.3 HashMap(哈希映射)
3.15.4 HashSet(哈希集合)
3.15.5 LinkedList(链表)
3.15.6 BTreeMap(B 树映射)
3.15.7 BTreeSet(B 树集合)