Question

    for (String fruit : list)
    {
        if("banane".equals(fruit))
            list.remove(fruit);
        System.out.println(fruit);
    }

Here a loop with remove instruction.
At execution time, I get some ConcurrentModificationException, below the console output:

Exception in thread "main" java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449)
at java.util.AbstractList$Itr.next(AbstractList.java:420)
at Boucle.main(Boucle.java:14)
abricot
banane

Question: How to remove some element with a loop?

Answer 1

You need to use the iterator directly, and remove the item via that iterator.

for (Iterator<String> iterator = list.iterator(); iterator.hasNext(); ) {
    String fruit = iterator.next();
    if ("banane".equals(fruit)) {
        iterator.remove();
    }
    System.out.println(fruit);
}