jdk8 特性 Lambda表达式

    public static void main(String[] args){
       List<SpecimenMessageCustomerParamsVm> historyHeaderStatisticsVOs=new ArrayList();
        SpecimenMessageCustomerParamsVm  obj1=new SpecimenMessageCustomerParamsVm();
        obj1.setProjectPrincipal(2);
        obj1.setJsonList("A");
        SpecimenMessageCustomerParamsVm  obj2=new SpecimenMessageCustomerParamsVm();
        obj2.setProjectPrincipal(3);
        obj2.setJsonList("c");
        SpecimenMessageCustomerParamsVm  obj3=new SpecimenMessageCustomerParamsVm();
        obj3.setProjectPrincipal(1);
        obj3.setJsonList("b");
        historyHeaderStatisticsVOs.add(obj1);
        historyHeaderStatisticsVOs.add(obj2);
        historyHeaderStatisticsVOs.add(obj3);

 /*       Map<String, List<SpecimenMessageCustomerParamsVm>> collectMap = historyHeaderStatisticsVOs.stream()
                .sorted(Comparator.comparing(iteam -> iteam.getProjectPrincipal()))
                .collect(Collectors.groupingBy(iteam -> iteam.getJsonList(), TreeMap::new, Collectors.toList()));*/
       // List<SpecimenMessageCustomerParamsVm> sort = sort(historyHeaderStatisticsVOs);

        historyHeaderStatisticsVOs.sort(Comparator.comparing(SpecimenMessageCustomerParamsVm::getJsonList).reversed().thenComparing(SpecimenMessageCustomerParamsVm::getJsonList));
     /*   System.out.println(sort);*/
        System.out.println(historyHeaderStatisticsVOs);
        historyHeaderStatisticsVOs.sort(Comparator.comparing(SpecimenMessageCustomerParamsVm::getJsonList).thenComparing(SpecimenMessageCustomerParamsVm::getJsonList));
        System.out.println(historyHeaderStatisticsVOs);

        //5.根据多个字段，进行排序
        //倒序：List.sort(Comparator.comparing(Entity::getState).reversed().thenComparing(Entity::getName));
       // 升序：List.sort(Comparator.comparing(Entity::getState).thenComparing(Entity::getName));

    }