Iterator.forEachRemaining semantics (original) (raw)

Arne Siegel v.a.ammodytes at googlemail.com
Sun Apr 21 09:41:22 PDT 2013

Hi,

the apidoc comment of Iterator.forEachRemaining says:

/**
 * Performs the given action for each remaining element, in the order
 * elements occur when iterating, until all elements have been processed or
 * the action throws an exception.  Errors or runtime exceptions thrown by
 * the action are relayed to the caller.
 *
 * @implSpec
 * <p>The default implementation behaves as if:
 * <pre>{@code
 *     while (hasNext())
 *         action.accept(next());
 * }</pre>

From this it can be deduced that the following can be true for any implementation:

iterator.forEachRemaining(x -> null).hasNext() == false

What about implementations that don't satisfy this condition? Can they be considered correct?

Regards Arne Siegel

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