Foreach循环

Question

任何人都可以帮助我为什么这个案例会例外吗？

IntStream i = IntStream.of(6,5,7,1, 2, 3, 3);
    IntStream d = i.map(n -> n+1 );
    d.forEach(System.out::print);
    System.out.println();
    System.out.println("Origional Streams" );
    i.forEach(System.out::print);

这是输出。

7682344
Origional Streams
Exception in thread "main" java.lang.IllegalStateException: stream has already been operated upon or closed
at java.util.stream.AbstractPipeline.sourceStageSpliterator(AbstractPipeline.java:279)
at java.util.stream.IntPipeline$Head.forEach(IntPipeline.java:557)

Answer 1

看那个

d = i.map(n -> n + 1);

表示流d正在引用流i， 现在forEach是一个终端操作，消耗i的流，也影响了参考d。