Collectors toCollection() method in Java 8

Java 8Object Oriented ProgrammingProgramming

The toCollection() method of the Collectors class in Java returns a Collector that accumulates the input elements into a new Collection in encounter order.

The syntax is as follows

static <T,C extends Collection<T>>
Collector<T,?,C> toCollection(Supplier<C> collectionFactory)

Here, the parameter

  • T - Type of the input elements
  • C - Type of the resulting Collection
  • Supplier: A supplier of results
  • collectionFactory - Supplier that returns a new, empty Collection of the appropriate type

To work with Collectors class in Java, import the following package

import java.util.stream.Collectors;

The following is an example to implement toCollection() method in Java

Example

 Live Demo

import java.util.Collection;
import java.util.TreeSet;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Demo {
   public static void main(String[] args) {
      Stream<String> stream = Stream.of("20", "50", "80", "100", "130", "150", "200");
      Collection<String> collection = stream.collect(Collectors.toCollection(TreeSet::new));
      System.out.println("Collection = "+collection);
   }
}

Output

Collection = [100, 130, 150, 20, 200, 50, 80]
raja
Updated on 30-Jul-2019 22:30:25

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