Detailed explanation of stream data flow in java8

Stream is an API introduced in Java 8 that heavily uses lambda expressions. Stream uses an intuitive way similar to querying data from a database with SQL statements to provide a high-level abstraction for the operation and expression of Java collections. Intuition means that when developers write code, they only need to focus on what the result they want, not on the specific way to achieve the result. In this chapter, we will introduce why we need a new data processing API, the differences between collection and stream, and how to apply the stream API to our coding.

Filter duplicate elements

The stream interface supports the distinct method, which returns a stream of elements (implemented according to the hashcode and equals methods of the elements generated by the stream).

For example, the following code filters out all even numbers in the list and ensures that there are no duplicates.

Skip the specified number of elements

Stream supports the skip (n) method to return a stream that throws away the first n elements. If there are less than n elements in the stream, an empty stream is returned. Limit (n) and skip (n) are complementary

Map operation

Stream supports the map method, which takes a function as an argument. This function is applied to each element and mapped to a new element

Element summation

Maximum

minimum value

summary

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