Java-Collectors

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How to find duplicate elements in a Stream in Java

Last Updated: 10 January 2023

Given a stream containing some elements, the task is to find the duplicate elements in this stream in Java.Examples:Input: Stream = {5, 13, 4, 21, 13, 27, 2, 59, 59, 34}Ou ...read more

Java-Collections-Class

Collectors groupingBy() method in Java with Examples

Last Updated: 29 July 2021

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 nee ...read more

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Collectors collectingAndThen() method in Java with Examples

Last Updated: 16 June 2022

The collectingAndThen(Collector downstream, Function finisher) method of class collectors in Java, which adopts Collector so that we can perform an additional finishing tr ...read more

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Collectors toMap() method in Java with Examples

Last Updated: 06 December 2018

The toMap() method is a static method of Collectors class which returns a Collector that accumulates elements into a Map whose keys and values are the result of applying t ...read more

Java-Stream-Collectors

Java-Collectors

Collectors partitioningBy() method in Java

Last Updated: 06 December 2018

Collectors partitioningBy() method is a predefined method of java.util.stream.Collectors class which is used to partition a stream of objects(or a set of elements) based o ...read more

Java-Stream-Collectors

Java 8

Java-Collectors

Collectors toList() method in Java with Examples

Last Updated: 06 December 2018

The toList() method of Collectors Class is a static (class) method. It returns a Collector Interface that gathers the input data onto a new list. This method never guarant ...read more

Java-Stream-Collectors

Java-Collectors

Java Stream | Collectors toCollection() in Java

Last Updated: 06 December 2018

Collectors toCollection(SupplierC collectionFactory) method in Java is used to create a Collection using Collector. It returns a Collector that accumulates the input eleme ...read more

Java-Stream-Collectors

Java-Collectors

Collectors toSet() in Java with Examples

Last Updated: 06 December 2018

Collectors toSet() returns a Collector that accumulates the input elements into a new Set. There are no guarantees on the type, mutability, serializability, or thread-safe ...read more

Java-Stream-Collectors

Java-Collectors

Java | Collectors maxBy(Comparator comparator) with Examples

Last Updated: 06 December 2018

Collectors maxBy(Comparator? super T comparator) is used to find an element according to the comparator passed as the parameter. It returns a Collector that produces the m ...read more

Java-Stream-Collectors

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Java | Collectors averagingDouble() with Examples

Last Updated: 06 December 2018

Collectors averagingDouble(ToDoubleFunction? super T mapper) method is used to find the mean of the double values passed in the parameters. This method returns a Collector ...read more

Java-Stream-Collectors

Java-Collectors

Java 8 | Collectors counting() with Examples

Last Updated: 06 December 2018

Collectors counting() method is used to count the number of elements passed in the stream as the parameter. It returns a Collector accepting elements of type T that counts ...read more

Java-Stream-Collectors

Java-Collectors

Java 8 Streams | Collectors.joining() method with Examples

Last Updated: 17 January 2023

The joining() method of Collectors Class, in Java, is used to join various elements of a character or string array into a single string object. This method uses the stream ...read more

Java-Stream-Collectors

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