Java 8 Stream IllegalStateException: Stream has already been operated on or closed

Question

I\'m trying to generate Order instances using the Stream API. I have a factory function that creates the order, and a DoubleStream is used to initialize the amount of the o

Answer 1

As said in other answers, Streams are single-use items and you have to create a new Stream each time you need one.

But, after all, this isn’t complicated when you remove all your attempts to store intermediate results. Your entire code can be expressed as:

Random r=new Random(); // the only stateful thing to remember

// defining and executing the chain of operations:
r.doubles(50.0, 200.0).mapToObj(Order::new).limit(10).forEach(System.out::println);

or even simpler

r.doubles(10, 50.0, 200.0).mapToObj(Order::new).forEach(System.out::println);