JAVA8新特性排序

   public static void main(String[] args) {
        FocPicture focPicture4 = new FocPicture();
        focPicture4.setCity("GO HOME");
        focPicture4.setOrder("4");
        focPicture4.setFlag("4");
        FocPicture focPicture1 = new FocPicture();
        focPicture1.setCity("北京");
        focPicture1.setOrder("1");
        focPicture1.setFlag("1");
        FocPicture focPicture2 = new FocPicture();
        focPicture2.setCity("上海");
        focPicture2.setOrder("2");
        focPicture2.setFlag("2");
        FocPicture focPicture3 = new FocPicture();
        focPicture3.setCity("广东");
        focPicture3.setOrder("3");
        focPicture3.setFlag("3");
        ArrayList<FocPicture> focPictures = new ArrayList<FocPicture>();
         focPictures.add(focPicture3);
         focPictures.add(focPicture1);
         focPictures.add(focPicture2);
         focPictures.add(focPicture4);

         //排序java8
         Collections.sort(focPictures, (o1, o2) -> o1.getOrder().compareTo(o2.getOrder()));
        // Collections.sort(focPictures, (o1, o2) -> {  return o1.getOrder().compareTo(o2.getOrder()); });
          System.out.println(focPictures.toString());
    }