Given:javaStringBuffer us = new StringBuffer("US");StringBuffer uk = new StringBuffer("UK");Stream stream = Stream.

In this code, two StringBuffer objects, us and uk, are created with the values "US" and "UK", respectively. A stream is then created from these objects using Stream.of(us, uk).

The collect method is used with Collectors.joining("-", "=", ""). The joining collector concatenates the elements of the stream into a single String with the following parameters:

Delimiter ("-"):Inserted between each element.

Prefix ("="):Inserted at the beginning of the result.

Suffix (""):Inserted at the end of the result.

Therefore, the elements "US" and "UK" are concatenated with "-" between them, resulting in "US-UK". The prefix "=" is added at the beginning, resulting in the final output =US-UK.