Best way to convert an ArrayList to a string

Answer 1

In Java 8 it's simple. See example for list of integers:

String result = Arrays.asList(1,2,3).stream().map(Object::toString).reduce((t, u) -> t + "\t" + u).orElse("");

Or multiline version (which is simpler to read):

String result = Arrays.asList(1,2,3).stream()
    .map(Object::toString)
    .reduce((t, u) -> t + "\t" + u)
    .orElse("");

Update - a shorter version

String result = Arrays.asList(1,2,3).stream()
                .map(Object::toString)
                .collect(Collectors.joining("\t"));