// find element in sorted list
  private static void testBinarySearch() {
    List<String> list = Lists.newArrayList("2", "4", "13", "31", "43");
    MutableList<String> mutableList = FastList.newListWith("2", "4", "13", "31", "43");

    // find element in sorted list
    int jdk = Collections.binarySearch(list, "13");
    int guava = Ordering.natural().binarySearch(list, "13");
    int gs = mutableList.binarySearch("13");

    System.out.println("find = " + jdk + ":" + guava + ":" + gs); // print find = 2:2:2
  }