What is the use of Stream in Java?

Description

1. Java 8 API adds a new abstraction called Stream, which allows you to process data using declarations.

2. Stream uses SQL statements to query data from the database in an intuitive way, providing high-level abstraction for Java set operations and performance.

3. The tream API can greatly improve the productivity of Java programmers, allowing programmers to write efficient, clean, and concise code.

Stream (stream) is a queue from a data source that supports aggregation operations.

Examples

List transactionsIds = widgets.stream() .filter(b -> b.getColor() == RED) .sorted((x,y) -> x.getWeight() - y.getWeight()) .mapToInt(Widget::getWeight) .sum();

What collection classes are there in Java

Collections in Java are mainly divided into four categories:

1, List List: ordered, repeatable;

2, Queue queue: ordered, repeatable;

3, Set collection: non-repeatable;

4, Map mapping: unordered, unique keys, non-unique values.

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