What's the Most Efficient Way to Create Delimited String Lists in Java?

How to Efficiently Build Delimited String Lists in Java

When working with Java, you may encounter scenarios where you need to create comma-separated strings for passing values to external services. While you can employ rudimentary methods involving repeated string concatenation, there are more efficient approaches that enhance both performance and code elegance.

Pre Java 8:

Before Java 8, Apache's commons lang library offered a convenient join method that mirrored the Ruby join functionality. It allowed you to concatenate elements using a specified delimiter.

Java 8 and Beyond:

However, with the introduction of Java 8, String manipulation capabilities were significantly enhanced. Java 8 introduced two primary methods for string joining:

• StringJoiner:

  StringJoiner joiner = new StringJoiner(",");
  joiner.add("01").add("02").add("03");
  String joinedString = joiner.toString(); // "01,02,03"

• String.join(delimiter, elements):

  String joinedString = String.join(" - ", "04", "05", "06"); // "04 - 05 - 06"

  This method can also work with an iterable collection of elements:

  List<String> strings = new LinkedList<>();
  strings.add("Java"); strings.add("is");
  strings.add("cool");
  String message = String.join(" ", strings);
  //message returned is: "Java is cool"

These methods provide a more efficient and concise way to build delimited strings, eliminating the need for manual string concatenation and improving code readability. Therefore, when working with Java versions 8 and above, it is recommended to utilize these built-in string joining capabilities for optimal performance and code elegance.

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