Best way to concatenate List of String objects? [duplicate]

Answer 1

Using the Functional Java library, import these:

import static fj.pre.Monoid.stringMonoid;
import static fj.data.List.list;
import fj.data.List;

... then you can do this:

List ss = list("foo", "bar", "baz");
String s = stringMonoid.join(ss, ", ");

Or, the generic way, if you don't have a list of Strings:

public static  String showList(List l, Show s) {
  return stringMonoid.join(l.map(s.showS_()), ", ");
}