要按照对象中的不同参数对ArrayList进行排序，可以使用Comparator接口来定义排序规则，并使用Collections.sort()方法对ArrayList进行排序。下面是一个示例代码：

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

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 +
                '}';
    }
}

class PersonNameComparator implements Comparator {
    @Override
    public int compare(Person p1, Person p2) {
        return p1.getName().compareTo(p2.getName());
    }
}

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

public class Main {
    public static void main(String[] args) {
        ArrayList persons = new ArrayList<>();
        persons.add(new Person("John", 25));
        persons.add(new Person("Alice", 18));
        persons.add(new Person("Bob", 30));

        // 按照姓名排序
        Collections.sort(persons, new PersonNameComparator());
        System.out.println("按照姓名排序：");
        for (Person person : persons) {
            System.out.println(person);
        }

        // 按照年龄排序
        Collections.sort(persons, new PersonAgeComparator());
        System.out.println("按照年龄排序：");
        for (Person person : persons) {
            System.out.println(person);
        }
    }
}

输出结果：

按照姓名排序：
Person{name='Alice', age=18}
Person{name='Bob', age=30}
Person{name='John', age=25}
按照年龄排序：
Person{name='Alice', age=18}
Person{name='John', age=25}
Person{name='Bob', age=30}