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. Jul 23, 2025 · The java.lang.string.join () method concatenates the given element with the delimiter and returns the concatenated string. Note that if an element is null, then null is added. The JDK 8 API has added a new class called java.util.StringJoiner, which allows you to join more than one String using a specified delimiter or joiner. For example, you can join multiple strings separated by comma ( ,) to create a CSV String, Or, even better, you can create a full path for a directory in Linux by joining String using forward slash ...
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