stream报错： stream has already been operated upon or closed

这是因为stream的terminal方法只能使用一次，如果再次使用会报错，如下代码已经用了count()方法了，再用iterator()方法就报错了。

public static void main(String[] args) {IntStream ints = new Random().ints(5);System.out.println(ints.count()); // IntStream 只能使用一次，所以后面再调用报错了PrimitiveIterator.OfInt iterator = ints.iterator();System.out.println(iterator.next());while (iterator.hasNext()){System.out.println(iterator.next());}
}

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