Java流是否等同于具有变量赋值的while

Question

是否存在与以下内容等效的流

List<Integer> ints;
while (!(ints = this.nextInts()).isEmpty()) {
// do work
}

Answer 1

首先,感谢@OlivierGrégoire的评论.它改变了我对新知识的回答.

编写您自己Spliterator的未知大小nextInts,然后您可以使用StreamSupport#stream创建流nextInts.例如:

generateUntil(this::nextInts, List::isEmpty).forEach(list -> {
    //do works
});

import static java.util.stream.StreamSupport.stream;

<T> Stream<T> generateUntil(final Supplier<T> generator, Predicate<T> stop) {
    long unknownSize = Long.MAX_VALUE;

    return stream(new AbstractSpliterator<T>(unknownSize, Spliterator.ORDERED) {
        @Override
        public boolean tryAdvance(Consumer<? super T> action) {
            T value = generator.get();

            if (stop.test(value)) {
                return false;
            }

            action.accept(value);
            return true;
        }
    }, false);
}