generateJsonForOptions

Test.java

вариант 0
  private String generateJsonForOptions(final String... values) {
    return "{" + IntStream.range(0, values.length / 2)
                    .boxed()
                    .map(i -> String.format("\\\"%s\\\":\\\"%s\\\"", values[2 * i], values[2 * i + 1]))
                    .collect(joining(";")) + "}";
  }

вариант 1
private String generateJsonForOptions(final String... values) {
    return "{" + IntStream.range(0, values.length / 2)
                    .boxed()
                    .map(i -> String.format("\\\"%s\\\":\\\"%s\\\";", values[2 * i], values[2 * i + 1]))
                    .reduce("", (s1, s2) -> s1 + s2)
                    .replaceAll(";$", "}");

  }
  
вариант 2
private String generateJsonForOptions(final String... values) {
    String result = IntStream.range(0, values.length / 2)
            .boxed()
            .map(i -> String.format("\\\"%s\\\":\\\"%s\\\";", values[2 * i], values[2 * i + 1]))
            .reduce("", (s1, s2) -> s1 + s2)
            .replaceAll(";$", ""); 
    return "{" + result + "}";
  }