使用带有Lambda的JDK8压缩流（java.util.stream.Streams.zip）

使用带有Lambda的JDK8压缩流（java.util.stream.Streams.zip）

我也需要它，因此我只是从b93中获取了源代码并将其放在“ util”类中。我必须对其稍作修改以使用当前的API。

供参考，以下是工作代码（风险自负…）：

public static<A, B, C> Stream<C> zip(Stream<? extends A> a,    Stream<? extends B> b,    BiFunction<? super A, ? super B, ? extends C> zipper) {    Objects.requireNonNull(zipper);    Spliterator<? extends A> aSpliterator = Objects.requireNonNull(a).spliterator();    Spliterator<? extends B> bSpliterator = Objects.requireNonNull(b).spliterator();    // Zipping looses DISTINCT and SORTED characteristics    int characteristics = aSpliterator.characteristics() & bSpliterator.characteristics() & ~(Spliterator.DISTINCT | Spliterator.SORTED);    long zipSize = ((characteristics & Spliterator.SIZED) != 0) ? Math.min(aSpliterator.getExactSizeIfKnown(), bSpliterator.getExactSizeIfKnown()) : -1;    Iterator<A> aIterator = Spliterators.iterator(aSpliterator);    Iterator<B> bIterator = Spliterators.iterator(bSpliterator);    Iterator<C> cIterator = new Iterator<C>() {        @Override        public boolean hasNext() { return aIterator.hasNext() && bIterator.hasNext();        }        @Override        public C next() { return zipper.apply(aIterator.next(), bIterator.next());        }    };    Spliterator<C> split = Spliterators.spliterator(cIterator, zipSize, characteristics);    return (a.isParallel() || b.isParallel())? StreamSupport.stream(split, true): StreamSupport.stream(split, false);}