如何在Java中为TreeMap编写自定义比较器？

public class Person {
    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    @Override
    public String toString() {
        return "Person{name='" + name + "', age=" + age + "}";
    }
}

import java.util.Comparator;

public class PersonAgeComparator implements Comparator<Person> {
    @Override
    public int compare(Person p1, Person p2) {
        return Integer.compare(p1.getAge(), p2.getAge());
    }
}

import java.util.Map;
import java.util.TreeMap;

public class Main {
    public static void main(String[] args) {
        Map<Person, String> personMap = new TreeMap<>(new PersonAgeComparator());

        personMap.put(new Person("Alice", 30), "Data1");
        personMap.put(new Person("Bob", 25), "Data2");
        personMap.put(new Person("Charlie", 35), "Data3");

        for (Map.Entry<Person, String> entry : personMap.entrySet()) {
            System.out.println(entry.getKey() + " -> " + entry.getValue());
        }
    }
}

Person{name='Bob', age=25} -> Data2
Person{name='Alice', age=30} -> Data1
Person{name='Charlie', age=35} -> Data3