Contents
V6053. Collection is modified while iteration is in progress. ConcurrentModificationException may occur.
The analyzer has detected a collection that gets modified while being iterated, although it was not designed for concurrent modification. This may raise a 'ConcurrentModificationException'.
Consider several examples of faulty code.
Example 1:
List<Integer> mylist = new ArrayList<>();
....
for (Integer i : mylist)
{
if (cond)
{
mylist.add(i * 2);
}
}Example 2:
List<Integer> myList = new ArrayList<>();
....
Iterator iter = myList.iterator();
while (iter.hasNext())
{
if (cond)
{
Integer i = (Integer) iter.next();
myList.add(i * 2);
}
}Example 3:
Set<Integer> mySet = new HashSet<>();
....
mySet.stream().forEach(i -> mySet.add(i * 2));However, the analyser will keep silent if a collection permits concurrent modification:
List<Integer> mylist = new CopyOnWriteArrayList<>();
....
for (Integer i : mylist)
{
if (cond)
{
mylist.add(i + 1);
}
}It will also keep silent if the loop terminates immediately after the collection is modified:
List<Integer> mylist = new ArrayList<>();
....
for (Integer i : mylist)
{
if (cond)
{
mylist.add(i + 1);
break;
}
}This diagnostic is classified as:
|
You can look at examples of errors detected by the V6053 diagnostic. |
Was this page helpful?
