What is the use of Stream in Java8
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Java8 provides a way of streaming computing for collections. This style treats the set of elements to be processed as a stream, which is transmitted in the pipeline, and can be processed on the nodes of the pipeline, such as filtering, sorting, aggregation, etc.
Stream API basically returns the Stream itself, so that multiple operations can be concatenated into a pipe, just like streaming (fluent style). This optimizes operations, such as deferred execution (laziness) and short circuit (short-circuiting).
Stream () creates a serial flow for the collection
ParallelStream () creates a parallel flow for the collection
Private void createStream () {Stream stream = getList () .stream (); Stream parallelStream = getList () .parallelStream ();}
Stream provides an internal traversal way forEach (), through forEach can greatly simplify the set traversal code.
Private void forEach () {getList () .forEach (I-> System.out.println (I);}
Stream provides a method filter () for data filtering, which can be easily implemented in conjunction with other API of stream.
Stream provides a method map () for data mapping, which can be easily implemented in conjunction with other API of stream.
Stream provides a method sorted () for data mapping, which can be easily sorted in conjunction with other API of stream.
The Collectors class implements many reduction operations, such as converting streams into collections and aggregate elements. Collectors can be used to return a list or string.
Some collectors that produce statistical results are also very useful. They are mainly used on basic types such as int, double, long, and so on, and they can be used to produce statistical results similar to the following.
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