使用Array.sort对 list 对象数组 进行排序

1. 自定义Comparator排序

public static void main(String[] args) {
        List<FormDataDetail> list = new ArrayList<>();
        FormDataDetail detail1 = new FormDataDetail();
        detail1.setContent("1");
        detail1.setDataIndex(1l);
        FormDataDetail detail2 = new FormDataDetail();
        detail2.setContent("2");
        detail2.setDataIndex(2l);
        FormDataDetail detail3 = new FormDataDetail();
        detail3.setContent("3");
        detail3.setDataIndex(3l);
        FormDataDetail detail4 = new FormDataDetail();
        detail4.setContent("4");
        detail4.setDataIndex(4l);
        list.add(detail1);
        list.add(detail3);
        list.add(detail2);
        list.add(detail4);
        FormDataDetail [] a = list.toArray(new FormDataDetail[list.size()]);
        for (FormDataDetail formDataDetail : list) {
            System.out.println(formDataDetail.getContent());
        }
        System.out.println("=======================");
        Arrays.sort(a, new Comparator<FormDataDetail>() {
            @Override
            public int compare(FormDataDetail o1, FormDataDetail o2) {
//                System.out.println("o1 =>" + o1.getDataIndex() + "   o2 =>" + o2.getDataIndex() + "       ");
//                System.out.println(o1.getDataIndex() > o2.getDataIndex());
                return o1.getDataIndex() > o2.getDataIndex() ? 0 : -1;
            }
        });
        for (FormDataDetail formDataDetail : a) {
            System.out.println(formDataDetail.getContent());
        }
    }