String.join
With Java 8 you can do this without any third party library.
If you want to join a Collection of Strings you can use the String.join() method:
List<String> list = Arrays.asList("foo", "bar", "baz");
String joined = String.join(" and ", list); // "foo and bar and baz"
Collectors.joining
If you have a Collection with another type than String you can use the Stream API with the joining Collector:
List<Person> list = Arrays.asList(
new Person("John", "Smith"),
new Person("Anna", "Martinez"),
new Person("Paul", "Watson ")
);
String joinedFirstNames = list.stream()
.map(Person::getFirstName)
.collect(Collectors.joining(", ")); // "John, Anna, Paul"
The StringJoiner class may also be useful.
Top answer 1 of 16
985
String.join
With Java 8 you can do this without any third party library.
If you want to join a Collection of Strings you can use the String.join() method:
List<String> list = Arrays.asList("foo", "bar", "baz");
String joined = String.join(" and ", list); // "foo and bar and baz"
Collectors.joining
If you have a Collection with another type than String you can use the Stream API with the joining Collector:
List<Person> list = Arrays.asList(
new Person("John", "Smith"),
new Person("Anna", "Martinez"),
new Person("Paul", "Watson ")
);
String joinedFirstNames = list.stream()
.map(Person::getFirstName)
.collect(Collectors.joining(", ")); // "John, Anna, Paul"
The StringJoiner class may also be useful.
2 of 16
307
All the references to Apache Commons are fine (and that is what most people use) but I think the Guava equivalent, Joiner, has a much nicer API.
You can do the simple join case with
Joiner.on(" and ").join(names)
but also easily deal with nulls:
Joiner.on(" and ").skipNulls().join(names);
or
Joiner.on(" and ").useForNull("[unknown]").join(names);
and (useful enough as far as I'm concerned to use it in preference to commons-lang), the ability to deal with Maps:
Map<String, Integer> ages = .....;
String foo = Joiner.on(", ").withKeyValueSeparator(" is ").join(ages);
// Outputs:
// Bill is 25, Joe is 30, Betty is 35
which is extremely useful for debugging etc.
Baeldung
baeldung.com › home › java › java list › joining a list in java with commas and “and”
Joining a List in Java With Commas and “and” | Baeldung
March 7, 2025 - Now, let’s walk through the code quickly. First, we handle cases where the list contains less than three elements using String.join(” and “, list).
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CodeGym
codegym.cc › java blog › strings in java › java string join() method
Java String join() Method
January 8, 2025 - Iterable which can be a list or array of elements, needs to be joined. It always returns a concatenated string of elements joined by the delimiter. import java.util.ArrayList; class Main { public static void main(String[] args) { ArrayList<String> arrayOfStrings = new ArrayList<>(); arrayOfStrings.add("Concatenating"); arrayOfStrings.add("the"); arrayOfStrings.add("array"); arrayOfStrings.add("list"); arrayOfStrings.add("elements"); arrayOfStrings.add("with"); arrayOfStrings.add("space"); arrayOfStrings.add("as"); arrayOfStrings.add("delimiter"); // joining arrayList with space between them as delimiter String joinedStr = String.join(" ", arrayOfStrings); System.out.println(joinedStr); } }
Mkyong
mkyong.com › home › java › java – how to join list string with commas
Java – How to join List String with commas | mkyong.com
November 29, 2018 - In Java, we can use String.join(",", list) to join a List String with commas.
W3Schools
w3schools.com › java › ref_string_join.asp
Java String join() Method
Java Examples Java Videos Java Compiler Java Exercises Java Quiz Java Code Challenges Java Practice Problems Java Server Java Syllabus Java Study Plan Java Interview Q&A ... The join() method joins one or more strings with a specified separator.
BeginnersBook
beginnersbook.com › 2017 › 10 › java-string-join-method
Java String join() method
June 4, 2024 - public class StringJoinExample { public static void main(String[] args) { // Here , is a delimiter and elements are strings String result = String.join(", ", "Cricket", "Hockey", "Tennis"); System.out.println(result); // Output: "Cricket, Hockey, Tennis" } } import java.util.Arrays; import java.util.List; public class StringJoinExample { public static void main(String[] args) { List<String> sports = Arrays.asList("Cricket", "Hockey", "Tennis"); // Here, we are joining elements of an ArrayList with // comma as delimiter String result = String.join(", ", sports); System.out.println(result); // Output: "Cricket", "Hockey", "Tennis" } }
Vultr Docs
docs.vultr.com › java › standard library › java › lang › string › join()
Java String join() - Concatenate Strings | Vultr Docs
December 27, 2024 - The join() method in Java is a static method in the String class that concatenates any number of strings together with a specified delimiter. It is particularly useful when you need to build a single string out of multiple substrings, adding ...
Baeldung
baeldung.com › home › java › java string › converting a list to string in java
Converting a List to String in Java | Baeldung
July 30, 2026 - If our elements in the List aren’t subclasses of CharSequence, we can first convert the List to a List<String>, and then pass it to String.join():
DEV Community
dev.to › satyam_gupta_0d1ff2152dcc › master-the-java-string-join-method-a-2025-guide-with-examples-best-practices-2oem
Master the Java String join() Method: A 2025 Guide with Examples & Best Practices - DEV Community
November 6, 2025 - Okay, cool, it joins strings. But where does this fit in a real project? Everywhere! Building CSV Data Need to generate a CSV line from a list of data? join() is your best friend. java List userData = List.of("John Doe", "john.doe@email.com", "New York"); String csvLine = String.join(",", userData); // Output: John Doe,john.doe@email.com,New York
How to do in Java
howtodoinjava.com › home › java array › join string array in java with comma or any separator
Join String Array in Java with Comma or Any Separator
3 weeks ago - The shortest way to join a String array in Java is String.join(“,”, array), which returns one String with the separator between every two elements and none after the last. The same method accepts a List or any other Iterable of strings.
amitph
amitph.com › home › java › convert list to concatenated string with delimiter in java
List of Strings to Concatenated String with Delimiter in Java | amitph
November 22, 2024 - We will see different examples to join the String. ... Firstly, concatenate a string without any delimiter. List<String> words = Arrays.asList("Convert", "List", "of", "Strings", "To", "String"); String concatenatedString = ""; for(String word: ...
CompileBytes
compilebytes.com › home › examples › java examples › how to join a list into a string in java
How to Join a List Into a String in Java | CompileBytes
September 25, 2026 - If the list holds numbers or other objects, stream it and convert each element first: list.stream().map(String::valueOf).collect(Collectors.joining(", ")). Before Java 8 the JDK had no join method at all, which is why old answers loop over a StringBuilder or pull in Guava's Joiner or Apache Commons' StringUtils.join.
Blogger
javarevisited.blogspot.com › 2016 › 06 › 10-examples-of-joining-string-in-java-8.html
10 Examples of Joining String in Java - String.join vs StringJoiner
May 11, 2023 - This is used to join any number of arbitrary String as it accepts individual String as a variable argument, so you can pass as many String as you want. The second version of join() accepts a CharSequence delimiter and Iterable of CharSequence, which means you can use this to join a list of String or an array of String in Java.
Medium
medium.com › javarevisited › nuanced-string-joining-in-java-7db547c331d0
Nuanced String Joining in Java | Javarevisited
April 23, 2024 - I wrote an article for 97 Things Every Java Programmer Should Know with the title “Learn to Kata and Kata to Learn.” In this article, I iterate through some example Java code using Collectors.joining() and String.join() to create a comma separated list of names.
Top answer 1 of 16
411
Use one of the the StringUtils.join methods in Apache Commons Lang.
import org.apache.commons.lang3.StringUtils;
String result = StringUtils.join(list, ", ");
If you are fortunate enough to be using Java 8, then it's even easier...just use String.join
String result = String.join(", ", list);
2 of 16
221
Using Java 8+
String str = list.stream().collect(Collectors.joining())
or even
String str = String.join("", list); // Substitute "" with your desired separator.
Top answer 1 of 6
166
Java 8...
String joined = String.join("+", list);
Documentation: http://docs.oracle.com/javase/8/docs/api/java/lang/String.html#join-java.lang.CharSequence-java.lang.Iterable-
2 of 6
100
You can use the StringUtils.join() method of Apache Commons Lang:
String join = StringUtils.join(joinList, "+");
GeeksforGeeks
geeksforgeeks.org › java › java-string-join-examples
Java String join() with examples - GeeksforGeeks
April 8, 2025 - join() method is included in java string since JDK 1.8. There are two types of join() methods in java string.
Sabe
sabe.io › blog › java-join-list-strings-delimiter
How to Join a List of Strings with a Delimiter in Java - Sabe.io
November 26, 2022 - In Java, lists are common because they allow you to store several pieces of the same type of data inside a single variable. For example, you can store a list of string, a list of numbers, or a list of objects. When you have a list of strings, you'll sometimes want to join them together into a single string.
Java67
java67.com › 2016 › 08 › java-8-stringjoin-example.html
How to Join Multiple Strings in Java 8 - String join() Example | Java67
You can use the String.join() method to join a number of String literals, String objects, String elements from an array, or String elements from List, Set, or any collection because it accepts an Iterable.
GeeksforGeeks
geeksforgeeks.org › java › stringjoiner-class-vs-string-join-method-to-join-string-in-java-with-examples
StringJoiner Class vs String.join() Method to Join String in Java with Examples - GeeksforGeeks
July 23, 2025 - The join() method was introduced in java string since JDK 1.8. String.join() method takes two parameters first is a delimiter and the second can be a list or array of elements or elements separated by ,(comma).