Join a list of strings with '[' as prefix, ']' as suffix, and ',' as delimiter using streams.

Source: Dev.to

Steps

1. Convert the list to a stream

   languageList.stream()

2. Collect the elements into a single string using Collectors.joining with a delimiter, a prefix, and a suffix:

   String result = languageList.stream()
                               .collect(Collectors.joining(",", "[", "]"));

   Collectors.joining(",", "[", "]") joins the elements of the stream into a single String, separated by commas, and adds [ at the beginning and ] at the end.

Result

The code above produces a string like:

[Java,Python,JavaScript]

Visual Example