Modify list while iterating Java 8

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Accordingly, can we modify collection while iterating?

It is not generally permissible for one thread to modify a Collection while another thread is iterating over it. Actually, the right way to handle such scenario is to use Iterator to remove the element from the underlying Collection while iterating over it.

Also Know, how can I avoid ConcurrentModificationException while iterating a list? To Avoid ConcurrentModificationException in multi-threaded environment

1. You can convert the list to an array and then iterate on the array.
2. You can lock the list while iterating by putting it in a synchronized block.
3. If you are using JDK1.

Hereof, can we remove element from ArrayList while iterating?

ArrayList provides the remove[] methods, e.g. remove [int index] and remove [Object element], you cannot use them to remove items while iterating over ArrayList in Java because they will throw ConcurrentModificationException if called during iteration.

Can we remove any element by using for each loop?

The program needs access to the iterator in order to remove the current element. The for-each loop hides the iterator, so you cannot call remove . Therefore, the for-each loop is not usable for filtering. Similarly it is not usable for loops where you need to replace elements in a list or array as you traverse it.