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HashSet不是线程安全的。如果在多线程环境下使用，需要外部同步或使用其他并发集合，如ConcurrentHashMap的键集合视图（尽管这不是HashSet，但提供了一种线程安全的集合实现方式）。 在Java中有各种的数据结构，有数组，链表，集合等等，我们也都经常使用，但是 ...

当然，我可以根据你的要求编写一篇关于 Java数组实现去重：效率最高的两种方法 的文章。 Java数组是Java ...

Inheritance and composition are two programming techniques developers use to establish the relationship between classes and objects. Whereas inheritance derives one class from another, composition ...

HashSet、LinkedHashSet、TreeSet，这三个常用的Set集合的共同点是都实现了Set接口，所以使用方式都是一样的，使用add() 方法添加元素，使用remove() 删除元素，使用contains() 方法判断元素是否存在，使用iterator()方法迭代遍历元素，这三个类都可以去除重复元素。