Web Reference: StringJoiner is used to construct a sequence of characters separated by a delimiter and optionally starting with a supplied prefix and ending with a supplied suffix. Prior to adding something to the StringJoiner, its sj.toString() method will, by default, return prefix + suffix. StringJoiner is a new class added in Java 8 under java.utilpackage. Simply put, it can be used for joining Stringsmaking use of a delimiter, prefix, and suffix. Jul 23, 2025 · StringJoiner class in Java provides an efficient way to concatenate multiple strings with a defined delimiter (character), optional prefix, and suffix. This class is especially useful when constructing formatted strings dynamically.
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