When parallel streams are used, the order of execution is not guaranteed. This gives parallel streams a performance advantage over sequential stream. How parallel streams workĪ parallel stream operates on the elements of the underlying stream in parallel and then combines the results at the end. This returns a parallel stream corresponding to foodStream. It then invokes the parallel method on foodStream.
#Java parallel streams code#
This code first creates a String Stream foodStream using the Stream.of method. Stream parallelFoodStream = foodStream.parallel() If the stream on which it is invoked in a parallel stream, it returns the stream itself.Ĭonsider the following code: Stream foodStream = Stream.of("Pizza","Sandwich","Burger","Rice") If the stream on which this method is invoked is a sequential stream, it returns a parallel stream corresponding to it. In addition, the Stream interface also has a method parallel.
This returns a String Stream which is a parallel stream. It then invokes the parallelStream method on food. This code first creates a String List food with some values. This returns a parallel stream on the underlying Collection.Ĭonsider the following code: List food = Arrays.asList("Pizza","Sandwich","Burger","Rice") Just like the stream method, all the Collection interfaces have a parallelStream method. Simply speaking, a parallel stream is a stream that operates on its elements in parallel. In this article, we will be taking a look at parallel streams.
In my earlier article, I had covered the Stream API in depth.
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