Java parallel stream not showing correct result | Wrong result when using parallel stream in java8

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Why Java parallel stream not showing correct result,Wrong result when using parallel stream.
Running in parallel may or may not be a benefit.
It depends what you are using this feature for.
Java 8 parallel streams may make your programs run faster. Or not. Or even slower.Thinking about streams as a way to achieve parallel processing at low cost will prevent developers to understand what is really happening. Streams are not directly linked to parallel processing.
Most of the above problems are based upon a misunderstanding: parallel processing is not the same thing as concurrent processing

Final Thoughts
Parallel streams are unpredictable and complex to use correctly. Almost any use of parallel streams can affect the performance of other unrelated system components in an unpredictable way. I have no doubt that there are people who can manage to use them to their benefit, clearly and correctly. However, I’d think twice before typing stream.parallel() into my code and would look twice when reviewing the code containing it.

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