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

Java Collections.singletonList() is a static method in the Java Collections class that returns an immutable list containing a single element. It is used when a single element needs to be represented as a list, often for passing to methods that expect a list as an argument. Introduced in Java 1997 with Java 1.2, singletonList() is commonly used in situations that require a read-only list with just one item.

https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html