Join comma if not empty or null

Question

I saw this answer of how to join String[] to comma separated string.

However I need the util to join the string in the array only if the values are not empty.

What is the best way to do it? without looping before on the String[] to remove. I prefer one method that does both.

EDITED

for instance:

I, love, , u 

will be:

 I love u 

Answer 1

In Java 8 you can use Stream:

    List<String> list = Arrays.asList("I", " ", "love", null, "you");     String message = list.stream().filter(StringUtils::isNotBlank)                      .collect(Collectors.joining(", "));     System.out.println("message = " + message); 

Answer 2

For Java 8 here is a solution using stream API .Filter null and empty Strings and join with a space between each string

String joined = Stream.of(I, love, , u)       .filter(s -> s != null && !s.isEmpty())       .collect(Collectors.joining(" "));