用java写一个程序：三位好友准备去某地旅游，现要在网上预订酒店。 现有 7 家酒店以供候选，分别以s1,s2,...,s7表示，三位用户分 别用u1,u2,u3表示。三人主要考虑酒店的三个属性：位置、是 否提供餐饮和装修风格。三个人对不同的属性有不同的偏好，且用户u1对于第二个属性的偏好与第一个属性的选择有关，使用CP-nets的思想返回每个用户的最佳选择结果的排序

以下是用 Java 编写的程序代码的示例：

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        List<Hotel> hotels = new ArrayList<>();
        hotels.add(new Hotel("s1", "Location1", true, "Decoration1"));
        hotels.add(new Hotel("s2", "Location2", false, "Decoration2"));
        hotels.add(new Hotel("s3", "Location3", true, "Decoration3"));
        hotels.add(new Hotel("s4", "Location4", false, "Decoration4"));
        hotels.add(new Hotel("s5", "Location5", true, "Decoration5"));
        hotels.add(new Hotel("s6", "Location6", false, "Decoration6"));
        hotels.add(new Hotel("s7", "Location7", true, "Decoration7"));

        List<User> users = new ArrayList<>();
        users.add(new User("u1", "Location1", false, "Decoration1"));
        users.add(new User("u2", "Location2", false, "Decoration2"));
        users.add(new User("u3", "Location3", true, "Decoration3"));

        for (User user : users) {
            List<Hotel> sortedHotels = new ArrayList<>(hotels);
            // Sort the hotels based on user preferences
            Collections.sort(sortedHotels, (h1, h2) -> {
                int locationScore1 = getLocationScore(h1, user);
                int locationScore2 = getLocationScore(h2, user);
                int foodScore1 = getFoodScore(h1, user);
                int foodScore2 = getFoodScore(h2, user);
                int decorationScore1 = getDecorationScore(h1, user);
                int decorationScore2 = getDecorationScore(h2, user);
                int totalScore1 = locationScore1 + foodScore1 + decorationScore1;
                int totalScore2 = locationScore2 + foodScore2 + decorationScore2;
                return totalScore2 - totalScore1;
            });
            System.out.println(user.getName() + ": " + sortedHotels);
        }
    }

    private static int getLocationScore(Hotel hotel, User user) {
        if (hotel.getLocation().equals(user.getPreferredLocation())) {
            return 3;
        } else {
            return 0;
        }
    }

    private static int getFoodScore(Hotel hotel, User user) {
        if (hotel.isFoodAvailable() && user.isFoodImportant()) {
            return 2;
        } else {
            return 0;
        }
    }

    private static int getDecorationScore(Hotel hotel, User user) {
        if (hotel.getDecoration().equals(user.getPreferredDecoration())) {
            return 1;
        } else {
            return 0;
        }
    }