But it turns out that programmers were using the word API long before online services appeared. They said that every library in a programming language had its own API - a set of methods it provided. So, when you write the "sort" command, you could say you are "using an API of a library that works with lists".
The Stream API is a library that works with data streams. Simply put, it's a set of commands that can be applied to a data stream. So what is a data stream?
Java is a language designed for creating enterprise software. These systems are essentially databases from which data is retrieved and updated. Usually for such tasks we use lists and loops. But if you write such program from the scratch, using "foreach" or "while" loops with numerous "if/else" conditions inside them, the program becomes very heavy. Therefore, some smart guys created more high-level tools that work not with single database record, but with a "stream" of records. Thus, a single command, on a single line, can replace a loop with if/else.
For example, the command .filter(x > 10) will return a list of records/objects with the field x > 10 and the command .sorted(x) will return a list of objects sorted by x.
Here are some PDF books about Java Stream API:
Mastering Java 8 Stream API
2025 by Kunal Bhangale
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Functional Programming with Java: An In-Depth Exploration and Implementation Guide
2024 by Adam Jones
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100 Java Mistakes and How to Avoid Them
2024 by Tagir Valeev
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