A quick and easy way to join array elements with a separator (the opposite of split) in Java [duplicate]
Using Java 8 you can do this in a very clean way:
String.join(delimiter, elements);This works in three ways:
1) directly specifying the elements
String joined1 = String.join(",", "a", "b", "c");2) using arrays
String[] array = new String[] { "a", "b", "c" };String joined2 = String.join(",", array);3) using iterables
List<String> list = Arrays.asList(array);String joined3 = String.join(",", list);
I prefer Google Collections over Apache StringUtils for this particular problem:
Joiner.on(separator).join(array)Compared to StringUtils, the Joiner API has a fluent design and is a bit more flexible, e.g. null elements may be skipped or replaced by a placeholder. Also, Joiner has a feature for joining maps with a separator between key and value.