What's the best way to build a string of delimited items in Java?

Question

While working in a Java app, I recently needed to assemble a comma-delimited list of values to pass to another web service without knowing how many elements there would be i

Answer 1

in Java 8 you can do this like:

list.stream().map(Object::toString)
        .collect(Collectors.joining(delimiter));

if list has nulls you can use:

list.stream().map(String::valueOf)
        .collect(Collectors.joining(delimiter))

it also supports prefix and suffix:

list.stream().map(String::valueOf)
        .collect(Collectors.joining(delimiter, prefix, suffix));