CODEWITHSUNDEEP
javacollectionsiteratorguava
rrunique
rrunique

Reputation: 25

Iterators.any in Guava library

Guava Iterators.any method documentation mentioned that this call will return one or more elements satisfy the predicate.Does it mean that the predicate run for all the elements in the iterator even though the first element satisfied the condition ?

Class Iterators

"Returns true if one or more elements returned by iterator satisfy the given predicate."

Upvotes: 0

Views: 303

Answers (1)

Marco Acierno
Marco Acierno

Reputation: 14847

Iterators.any source:

647 public static <T> boolean any(
648       Iterator<T> iterator, Predicate<? super T> predicate) {
649     checkNotNull(predicate);
650     while (iterator.hasNext()) {
651       T element = iterator.next();
652       if (predicate.apply(element)) {
653         return true;
654       }
655     }
656     return false;
657 }

It's a normal Iterator.

It will iterate until founds an element which is OK for the predicate. When it finish because the return true; it means at least one element satisfied the condition but it could happen that others too satisfied the condition without the need to check. (that's the Returns true if one or more part)

But if none satisfied the condition it will return false since noone stopped the iterator.

Upvotes: 3

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