Java 25 (LTS) reference · String Methods

Java String.join() Method

Join strings or a collection of strings into one string, with a separator between them.

Java 25 (LTS) Since Java 8

Create a free account to save this page, take notes and track your progress. Sign in

Syntax

String.join(delimiter, elements)

Parameters

Parameter	Description
`delimiter` CharSequence	Text placed between elements.
`elements` CharSequence...	The strings, as varargs or an `Iterable`.

Return value

A new String.

Examples

Join values and lists

import java.util.*;

public class Main {
    public static void main(String[] args) {
        System.out.println(String.join(", ", "Java", "Kotlin", "Scala"));
        List<String> tags = List.of("api", "backend", "java");
        System.out.println(String.join(" #", tags));
    }
}

Output

Java, Kotlin, Scala
api #backend #java

Run this on your computer — see “Get Started” for setup.

Build a path

public class Main {
    public static void main(String[] args) {
        String path = String.join("/", "home", "ana", "projects");
        System.out.println(path);
    }
}