将ArrayList中的对象转换为字符串

import java.util.ArrayList;

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

        String result = arrayListToString(personList);
        System.out.println(result);
    }

    public static String arrayListToString(ArrayList<?> arrayList) {
        StringBuilder sb = new StringBuilder();
        for (Object obj : arrayList) {
            sb.append(obj.toString()).append(", ");
        }
        if (sb.length() > 0) {
            sb.setLength(sb.length() - 2); // 去除最后一个逗号和空格
        }
        return sb.toString();
    }
}

class Person {
    private String name;
    private int age;

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

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

Person{name='Alice', age=20}, Person{name='Bob', age=25}, Person{name='Charlie', age=30}