去除List集合中重复对象（以某些属性值相同为对象相同的判断依据）

//对powerModels,按照dormitoryId和bedroomNo去重
    for (int i = 0; i < powerModels.size() - 1; i++) {
        for (int j = powerModels.size() - 1; j > i; j--) {
            if (powerModels.get(j).getBedroomNo().equals(powerModels.get(i).getBedroomNo()) &&
                    powerModels.get(j).getDormitoryId().equals(powerModels.get(i).getDormitoryId())) {
                powerModels.remove(j);
            }
        }
    }