How Can I Efficiently Join Strings with Delimiters in Java?

Delimiting Items Elegantly in Java

In scenarios where you need to concatenate numerous values with a delimiter while avoiding redundant string handling, Java offers several approaches:

Pre-Java 8:

Apache Commons Lang's StringUtils.join() method provides a concise and efficient solution:

String joinedString = StringUtils.join(Arrays.asList("elementName", "anotherElementName"), ",");

Java 8:

StringJoiner:

StringJoiner allows for incremental concatenation:

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

String.join():

This method offers a more concise syntax:

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

For iterable elements:

List<String> strings = Arrays.asList("Java", "is", "cool");
String message = String.join(" ", strings); // "Java is cool"

By utilizing these techniques, you can seamlessly concatenate delimited items in Java, enhancing code clarity and efficiency.

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