Java8 - What is Parallel Stream|Sequential vs Parallel Stream|how to use parallel stream in java
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In this video we are going to discuss about how to sequential stream and parallel stream. We are gonna perform a test how Sequential and Parallel and how they gonna share the available processors .
Parallel vs Sequential Stream in Java :
A stream in Java is a sequence of objects which operates on a data source such as an array or a collection and supports various methods. It was introduced in Java 8’s java.util.stream package. Stream supports many aggregate operations like filter, map, limit, reduce, find, and match to customize the original data into a different form according to the need of the programmer. The operations performed on a stream do not modify its source hence a new stream is created according to the operation applied to it. The new data is a transformed copy of the original form.
Sequential Stream
Sequential Streams are non-parallel streams that use a single thread to process the pipelining. Any stream operation without explicitly specified as parallel is treated as a sequential stream. Sequential stream’s objects are pipelined in a single stream on the same processing system hence it never takes the advantage of the multi-core system even though the underlying system supports parallel execution. Sequential stream performs operation one by one. stream() method returns a sequential stream in Java.
Parallel Stream
It is a very useful feature of Java to use parallel processing, even if the whole program may not be parallelized. Parallel stream leverage multi-core processors, which increases its performance. Using parallel streams, our code gets divide into multiple streams which can be executed parallelly on separate cores of the system and the final result is shown as the combination of all the individual core’s outcomes. It is always not necessary that the whole program be parallelized, but at least some parts should be parallelized which handles the stream. The order of execution is not under our control and can give us unpredictably unordered results and like any other parallel programming, they are complex and error-prone.
The Java stream library provides a couple of ways to do it. easily, and in a reliable manner.
One of the simple ways to obtain a parallel stream is by invoking the parallelStream() method of Collection interface.
Another way is to invoke the parallel() method of BaseStream interface on a sequential stream.
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In this video we are going to discuss about how to sequential stream and parallel stream. We are gonna perform a test how Sequential and Parallel and how they gonna share the available processors .
Parallel vs Sequential Stream in Java :
A stream in Java is a sequence of objects which operates on a data source such as an array or a collection and supports various methods. It was introduced in Java 8’s java.util.stream package. Stream supports many aggregate operations like filter, map, limit, reduce, find, and match to customize the original data into a different form according to the need of the programmer. The operations performed on a stream do not modify its source hence a new stream is created according to the operation applied to it. The new data is a transformed copy of the original form.
Sequential Stream
Sequential Streams are non-parallel streams that use a single thread to process the pipelining. Any stream operation without explicitly specified as parallel is treated as a sequential stream. Sequential stream’s objects are pipelined in a single stream on the same processing system hence it never takes the advantage of the multi-core system even though the underlying system supports parallel execution. Sequential stream performs operation one by one. stream() method returns a sequential stream in Java.
Parallel Stream
It is a very useful feature of Java to use parallel processing, even if the whole program may not be parallelized. Parallel stream leverage multi-core processors, which increases its performance. Using parallel streams, our code gets divide into multiple streams which can be executed parallelly on separate cores of the system and the final result is shown as the combination of all the individual core’s outcomes. It is always not necessary that the whole program be parallelized, but at least some parts should be parallelized which handles the stream. The order of execution is not under our control and can give us unpredictably unordered results and like any other parallel programming, they are complex and error-prone.
The Java stream library provides a couple of ways to do it. easily, and in a reliable manner.
One of the simple ways to obtain a parallel stream is by invoking the parallelStream() method of Collection interface.
Another way is to invoke the parallel() method of BaseStream interface on a sequential stream.
You can access following full courses in Udemy , if you need coupons inbox me
********************************************************************************
Java Programming for Complete Stranger [Beginner Course]: https://www.udemy.com/course/java-pro...
Java8 New Features : https://www.udemy.com/course/lambda-w...
Java8 New Features in Tamil : https://www.udemy.com/course/java-fun...
Java9 New Features : https://www.udemy.com/course/java9-ne...
Mastery in Python - For Beginners from Zero to Hero : https://www.udemy.com/course/mastery-...
Java Interview Questions : https://www.udemy.com/course/java-int...
Python from Intermediate to Expert : https://www.udemy.com/course/python-b...
********************************************************************************
Like , Share and leave us your comments
********************************************************************************
Thanks For Watching !!!
********************************************************************************
Subscribe Our Channel : https://goo.gl/HhwC5i
4 سال پیش
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