import java.util.Map; import java.util.regex.Pattern; import java.util.stream.Collectors; class DoubleSplitLambda { public static void main(String[] args) { String input = "foo=bar&bar=foo&baz=foobar"; Pattern.compile("&").splitAsStream(input) .map(s->s.split("=")) .collect(Collectors.toMap(e->e[0], e->e[1])) .forEach((k,v) -> System.out.println(k+"="+v)); } }