Calling remove in foreach loop in Java

0 votes

In Java, is it legal to call remove on a collection when iterating through the collection using a foreach loop?

List<String> names = ....
for (String name : names) {
   // Do something
   names.remove(name).
}
Is it legal to remove items that have not been iterated over yet?
//Assume that the names list as duplicate entries
List<String> names = ....
for (String name : names) {
    // Do something
    while (names.remove(name));
}
Sep 26, 2018 in Java by Sushmita
• 6,840 points
103 views

1 answer to this question.

0 votes

To safely remove from a collection while iterating over it you should use an Iterator.

For example:

List<String> names = ....
Iterator<String> i = names.iterator();
while (i.hasNext()) {
   String s = i.next(); // must be called before you can call i.remove()
   // Do something
   i.remove();
}
answered Sep 26, 2018 by sharth
• 3,320 points

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