Set<String> entry = take a copy of all starting entries
Set<String> exit = take a copy of all last entries
entry.removeAll(exit)
- leaves only entries in entry point that are only in entry Set, not in exit Set
entry.retainAll(exit)
- leaves only entries that are in both sets
You can try using Set, as it allows you to remove and retain elements-
Set<String> entry = take a copy of all starting entries
Set<String> exit = take a copy of all last entries
entry.removeAll(exit)
- leaves only entries in entry point that are only in entry Set, not in exit Set
entry.retainAll(exit)
- leaves only entries that are in both sets
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您可以尝试使用 set ，因为它允许您删除并保留元素 -
You can try using Set, as it allows you to remove and retain elements-