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Tag Archives: Java-Collectors

Java Collector is the utility class that provides many helpful methods and functions for the collector interface. Mainly collector implementation is used with the stream… Read More
Collectors is one of the utility class in JDK which contains a lot of utility functions. It is mostly used with Stream API as a… Read More
Introduced in Java 8, the Stream API is used to process collections of objects. A stream is a sequence of objects that supports various methods… Read More
Given a stream containing some elements, the task is to find the duplicate elements in this stream in Java. Examples: Input: Stream = {5, 13,… Read More
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… Read More
The collectingAndThen(Collector downstream, Function finisher) method of class collectors in Java, which adopts Collector so that we can perform an additional finishing transformation. Syntax :… Read More
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… Read More
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 on… Read More
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.… Read More
Collectors toCollection(Supplier<C> collectionFactory) method in Java is used to create a Collection using Collector. It returns a Collector that accumulates the input elements into a… Read More
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-safety… Read More
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… Read More
Collectors minBy(Comparator<? super T> comparator) is used to find an element according to the comparator passed as the parameter. It returns a Collector that produces… Read More
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
Collectors averagingLong(ToLongFunction<? super T> mapper) method is used to find the mean of the long values passed in the parameters. This method returns a Collector… Read More

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