Java Streams - Collectors joining(CharSequence delimiter) example

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Collectors joining(CharSequence delimiter) returns a Collector that concatenates the input elements, separated by the specified delimiter, in encounter order.

Syntax

joining has the following syntax.

public static Collector<CharSequence,?,String> joining(CharSequence delimiter)

Example

The following example shows how to use joining.

import java.util.stream.Collectors;
import java.util.stream.Stream;
//  w w w.ja  va 2 s  . c o  m
public class Main {
  public static void main(String[] args) {
    Stream<String> s = Stream.of("a","b","c");
    
    String names = s
        .collect(Collectors.joining(", "));

    System.out.println(names);
  }
}

The code above generates the following result.

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