Java开发问题

Issue with below snippet on boundary matchers regex ()(边界匹配器正则表达式 () 上的以下片段问题)
HashSet contains duplicate entries(HashSet 包含重复的条目)
Any implementation of Ordered Set in Java?(Java中有序集的任何实现?)
Get unique values from ArrayList in Java(从 Java 中的 ArrayList 获取唯一值)
Efficiently compute Intersection of two Sets in Java?(在 Java 中有效地计算两个集合的交集?)
What is the best way get the symmetric difference between two sets in java?(在java中获得两组之间对称差异的最佳方法是什么?)
Getting the difference between two sets(获取两组之间的差异)
What is the fastest way to compare two sets in Java?(在 Java 中比较两组的最快方法是什么?)
Getting an element from a Set(从 Set 中获取元素)
How to convert an Array to a Set in Java(如何在 Java 中将数组转换为集合)
Picking a random element from a set(从集合中选择一个随机元素)
What is the difference between Set and List?(集合和列表有什么区别?)