Java 8 Collectors.joining() example

In this source code example, we show how to use Java 8 Collectors.joining() method with an example.

Java 8 Collectors.joining() example

In below example, we join list of strings using Java 8 Collectors.joining() method:

import java.util.List;import java.util.ArrayList;import java.util.stream.Collectors;public class JavaCollectToListEx {    public static void main(String[] args) {        List< String > programmingLanguages = new ArrayList< > ();        programmingLanguages.add("C");        programmingLanguages.add("C++");        programmingLanguages.add("Java");        programmingLanguages.add("Kotlin");        programmingLanguages.add("Python");        programmingLanguages.add("Perl");        programmingLanguages.add("Ruby");        // filter all four character words into a list        String joined = programmingLanguages.stream().collect(Collectors.joining(","));        System.out.printf("Joined string: %s", joined);    }}

Output:

Joined string: C,C++,Java,Kotlin,Python,Perl,Ruby

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