java根據list中的對象某個屬性排序

public class Test {
    public static void main(String[] args) throws Exception {
        CityModel city1 = new CityModel();
        city1.setCity_code(1);

        CityModel city2 = new CityModel();
        city2.setCity_code(1);

        CityModel city3 = new CityModel();
        city3.setCity_code(1);

        CityModel city4 = new CityModel();
        city4.setCity_code(1);

        CityModel city5 = new CityModel();
        city5.setCity_code(1);

        ArrayList<CityModel> list = new ArrayList<>();
        list.add(city1);
        list.add(city2);
        list.add(city3);
        list.add(city4);
        list.add(city5);

        Collections.sort(list, new Comparator<CityModel>(){
            public int compare(CityModel o1, CityModel o2) {
                //按照CityModel的city_code字段進行降序排列

 if(o1.getCity_code() < o2.getCity_code()){
 return 1;
 }
 if(o1.getCity_code() == o2.getCity_code()){
 return 0;
 }
 return -1;
 }
 });

 System.out.println(list);
 }
}

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