Java 8 features - class 36 - Collectors class ||partitioningBy() method ||complete summary
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partitioningBy() method of Collectors class:-
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In Java 8, partitioning is commonly used with the Stream API to divide a collection into two parts based on a given predicate. The most straightforward way to achieve this is through the Collectors.partitioningBy() method, which is a part of the Collectors utility class.
Purpose:
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Partitioning allows you to classify elements of a collection into two groups: those that match a specified condition (predicate) and those that do not.
Return Type:
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The result of partitioning is a Map Boolean, List T. The keys in this map are Boolean values: true for elements that match the predicate and false for those that do not. The values are lists of elements from the original collection that fall into each category.
Usage:
You can use Collectors.partitioningBy() with any stream. It is typically used with a lambda expression or method reference to define the condition for partitioning.
Benefits of Partitioning:-
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Simplicity: It allows you to efficiently group data based on a binary condition.
Readability: Using streams and collectors improves code readability and maintainability.
Declarative Style: It promotes a more functional programming style, separating the "what" from the "how."
Summary:-
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Partitioning in Java 8 via Collectors.partitioningBy() provides a powerful and elegant way to categorize data in a collection based on a condition. It leverages the capabilities of the Stream API to perform this operation in a clear and concise manner.