https://DevOpsCloud.io -- Cloud Monk Losang Jinpa, Ph.D., MCSE/MCT, GitOps DevOps Engineer

Java String.join() is a static method in the Java String class that joins an array or collection of strings with a specified delimiter. It is useful for combining multiple strings into a single string, with a separator between each element. Introduced in Java 2014 with Java 8, join() is commonly used in applications that need to concatenate strings or format output for CSVs, logs, or user interfaces.

https://docs.oracle.com/javase/8/docs/api/java/lang/String.html