Java Stream API Collectors Utility Class: groupingBy, partitioningBy & more | Java Mastery Series
#Java #JavaCollectors #GroupingBy
Master the Java Collectors Utility Class! In this tutorial, we dive deep into the absolute best way to organize, group, and summarize the data coming out of your Stream API pipelines.
We start with a quick introduction to the Collectors class before jumping into the joining method to see how easily you can merge strings together. Then, we look at the powerful numeric operations you can run, including summingInt, averagingInt, and the incredibly useful IntSummaryStatistics class.
After that, we tackle the heavy hitters: groupingBy (to organize your data like a SQL database) and partitioningBy (to perfectly split your data into true/false categories). We wrap up by covering essential operations like mapping, filtering, and finding the min/max values, and leave you with a completely free Quick Reference Table you can screenshot and use for your daily coding!
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⏳ Chapters:
0:00 - Collectors Utility Class Intro
0:55 - joining
4:45 - Counting & Summarizing (IntSummaryStatistics, averagingInt, summingInt)
6:54 - groupingBy
16:02 - partitioningBy
17:06 - mapping, filtering, maxBy, minBy
20:22 - Collectors Quick Reference Table
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