The concept of Stream, the new feature of Java 8

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What is Stream and what is Stream?

Is a data channel for manipulating the sequence of elements generated by data sources (collections, arrays, and so on). "Collections are about data, and streams are about computing!"

Note:

① Stream does not store elements itself.

② Stream does not change the source object. Instead, they return a new Stream that holds the results.

The ③ Stream operation is deferred. This means that they will wait until the results are needed.

The operation of Stream has three steps.

① creates Stream a data source (such as collection, array) to get a stream

② intermediate operation is an intermediate operation chain to process the data of the data source.

③ termination operation (terminal operation) A termination operation that executes an intermediate operation chain and produces a result

Create Stream

The Collection interface in Java8 is extended to provide two ways to get the stream:

① default Stream stream (): returns a sequential stream

② default Stream parallelStream (): returns a parallel flow

Create a flow from an array

The static method stream () of Arrays in Java8 can get the array flow:

1 static Stream stream (T [] array): returns a stream overloaded form that can handle arrays of corresponding basic types:

2 public static IntStream stream (int [] array)

3 public static LongStream stream (long [] array)

4 public static DoubleStream stream (double [] array)

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