Java Comparator给出要比较的属性的名称

import java.lang.reflect.Field;
import java.util.Comparator;

public class PropertyComparator implements Comparator<Object> {
    private String propertyName;

    public PropertyComparator(String propertyName) {
        this.propertyName = propertyName;
    }

    @Override
    public int compare(Object obj1, Object obj2) {
        try {
            Field field1 = obj1.getClass().getDeclaredField(propertyName);
            Field field2 = obj2.getClass().getDeclaredField(propertyName);
            field1.setAccessible(true);
            field2.setAccessible(true);

            Comparable value1 = (Comparable) field1.get(obj1);
            Comparable value2 = (Comparable) field2.get(obj2);

            return value1.compareTo(value2);
        } catch (NoSuchFieldException | IllegalAccessException e) {
            e.printStackTrace();
        }

        return 0;
    }
}

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

public class Main {
    public static void main(String[] args) {
        List<Person> persons = new ArrayList<>();
        persons.add(new Person("Alice", 25));
        persons.add(new Person("Bob", 30));
        persons.add(new Person("Charlie", 20));

        // 按照年龄进行排序
        Collections.sort(persons, new PropertyComparator("age"));

        for (Person person : persons) {
            System.out.println(person.getName() + " - " + person.getAge());
        }
    }
}

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;
    }
}