Java-有空值（NULL） List 对象按字段排序（空值在最后）

        List catList = new ArrayList<>();
        //加入4个对象
        Car car1 = new Car();
        car1.setTestFiled(1.02);
        Car car2 = new Car();
        car2.setTestFiled(null);
        Car car3 = new Car();
        car3.setTestFiled(1.04);
        Car car4 = new Car();
        car4.setTestFiled(1.05);
        catList.add(car1);
        catList.add(car2);
        catList.add(car3);
        catList.add(car4);

        catList.sort(Comparator.comparing(Car::getTestFiled,Comparator.nullsLast(Double::compareTo)));
        System.out.println("正序：");
        System.out.println(catList);
        catList.sort(Comparator.comparing(Car::getTestFiled,Comparator.nullsFirst(Double::compareTo)).reversed());
        System.out.println("倒序：");