* Testcase Example: '["MyHashSet","add","add","contains","contains","add","contains","remove","contains"]\n[[],[1],[2],[1],[3],[2],[2],[2],[2]]' * Design a HashSet ...
> 原文:[https://www . geesforgeks . org/how-copy-or-append-hashset-to-other-hashset-in-Java/](https://www.geeksforgeeks.org/how-to-copy-or-append-hashset-to-another ...
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