Java 8 features - class 34 - Collectors class -groupingBy() method and multi level grouping

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Collectors.groupingBy: A versatile collector that can group elements by a specified criterion.
Nested Grouping: By nesting groupingBy calls, you can achieve multilevel grouping.
Flexibility: You can define complex grouping criteria, such as using a function to categorize data into ranges.
Performance Considerations
Memory Usage: Grouping large datasets may consume significant memory due to the creation of multiple collections.
Parallel Processing: Streams can be processed in parallel to improve performance, but this requires careful handling of mutable shared data.
Conclusion
The Collectors.groupingBy method in Java 8 is a powerful tool for categorizing data. By leveraging single and multilevel grouping, you can transform collections into meaningful structures that make data analysis and retrieval much easier.

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