https://github.com/hoseinrezaeem/stream_mapgrouping
Java8 - Stream
https://github.com/hoseinrezaeem/stream_mapgrouping
collection funtional groupingby interface java-8 lambda map stream
Last synced: over 1 year ago
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Java8 - Stream
- Host: GitHub
- URL: https://github.com/hoseinrezaeem/stream_mapgrouping
- Owner: HoseinRezaeeM
- Created: 2023-10-22T17:28:12.000Z (over 2 years ago)
- Default Branch: master
- Last Pushed: 2023-10-30T19:40:45.000Z (over 2 years ago)
- Last Synced: 2025-01-26T06:41:08.290Z (over 1 year ago)
- Topics: collection, funtional, groupingby, interface, java-8, lambda, map, stream
- Language: Java
- Homepage:
- Size: 80.1 KB
- Stars: 2
- Watchers: 1
- Forks: 0
- Open Issues: 0
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Metadata Files:
- Readme: README.md
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README
# Stream_Map_grouping
The groupingBy()
method of Collectors class in Java are used for grouping objects by some property and storing results in a Map instance. In order to use it, we always need to specify a property by which the grouping would be performed. This method provides similar functionality to SQL’s GROUP BY clause.
Syntax:
public static Collector> groupingBy(Function classifier)
Type Parameter: This method takes two type parameters:
T- It is the type of the input elements.
K- It is the type the input elements to be converted.
Parameters: This method accepts two mandatory parameters:
Function- It is the property which is to be applied to the input elements.
Classifier- It is used to map input elements into the destination map.
Return value: It returns a collector as a map.
