Java中List按自定义顺序排序的几种实现过程

@Data
public class Person {
    private String name;
    private int age;
    private String province;
}

Map<String, Integer> provinceOrder = Map.of(
    "北京", 1,
    "上海", 2,
    "广州", 3,
    "深圳", 4
);

persons.sort(Comparator.comparingInt(
    p -> provinceOrder.getOrDefault(p.getProvince(), Integer.MAX_VALUE)
));

enum ProvincePriority {
    BEIJING("北京", 1),
    SHANGHAI("上海", 2),
    GUANGZHOU("广州", 3),
    SHENZHEN("深圳", 4),
    OTHER("其他", Integer.MAX_VALUE);
    
    private final String name;
    private final int priority;
    
    // 构造函数、getter等
    
    public static int getPriority(String provinceName) {
        return Arrays.stream(values())
                   .filter(pp -> pp.name.equals(provinceName))
                   .findFirst()
                   .orElse(OTHER)
                   .getPriority();
    }
}

persons.sort(Comparator.comparingInt(
    p -> ProvincePriority.getPriority(p.getProvince())
));

List<String> order = List.of("北京", "上海", "广州", "深圳");

persons.sort(Comparator.comparingInt(p -> {
    int index = order.indexOf(p.getProvince());
    return index == -1 ? Integer.MAX_VALUE : index;
}));

persons.sort(Comparator
    .comparingInt(p -> provinceOrder.getOrDefault(p.getProvince(), Integer.MAX_VALUE))
    .thenComparing(Person::getAge)
);