What is a StringJoiner in Java 8?

StringJoiner is a new class in Java 8 that can be used to create a String. It can construct a sequence of characters separated by a delimiter. It can also optionally add a prefix and suffix to this sequence. We can use this sequence to get a String.

The String “[One:Two:Three]” may be constructed as follows:

StringJoiner sj = new StringJoiner(“:”, “[“, “]”);
String desiredString = sj.toString();

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