Java中HashSet详解
一文带你掌握Java中的HashSet
HashSet 基于 HashMap 来实现的,是一个不允许有重复元素的集合。HashSet 实现了 Set 接口。HashSet 允许有 null 值。HashSet 是无序的,即不会记录插入的顺序。HashSet 不是线程安全的, 如果多个线程尝试同时修改[详细]
2023-05-09 10:38 分类:开发Creating C++ objects
I noticed that there are two ways to create C++ objects: BTree *btree = new BTree; and BTree btree; From what I can tell, the only开发者_JS百科 difference is in how class objects are accessed (.[详细]
2022-12-28 16:30 分类:问答