Java circular traversal method for deleting elements in list and set sets (recommended)

Today, when I was working on a project, I needed to delete some elements in the list and set. At that time, I used the method of traversing while deleting, but the following exception was reported:

ConcurrentModificationException

In order not to forget it later, use a rotten pen to record it as follows:

The writing method of error code, that is, the writing method of reporting the above exception:

Note: if you use the above writing method, the concurrencemodificationexception above will be reported. The reason is that the collection cannot be deleted while traversing.

The correct wording is as follows:

1. Traverse and delete list

2. Traverse delete set

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