How Can I Efficiently Join Array Elements with a Separator in Java?

Join Array Elements with a Separator in Java

Question:

Seeking an efficient way to concatenate array elements with a specified separator, akin to the inverse operation of splitting.

Solution:

Using Java 8's String.join() Method:

Java 8 introduces a convenient method called String.join(), which streamlines this task:

String joinedString = String.join(delimiter, elements);

where:

• delimiter is the separator to be inserted between elements.
• elements can be specified directly, as an array, or as an iterable.

This method works in a straightforward manner:

• Direct Element Specification:

  String joined1 = String.join(",", "a", "b", "c");

• Array Input:

  String[] array = {"a", "b", "c"};
  String joined2 = String.join(",", array);

• Iterable Input:

  List<String> list = Arrays.asList(array);
  String joined3 = String.join(",", list);

Using String.join() ensures an efficient and concise solution for combining array elements with a separator in Java.

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