使用Java8 streams将Map<String、List<Person>>转换为Map<String、List<Employee>>。我这样做了，但是没有for循环怎么做呢？

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        Map<String, List<Person>> personMap = ...; // 原始的Map<String, List<Person>>

        Map<String, List<Employee>> employeeMap = personMap.entrySet().stream()
                .collect(Collectors.toMap(Map.Entry::getKey, e -> e.getValue().stream()
                        .map(person -> new Employee(person.getName(), person.getAge()))
                        .collect(Collectors.toList())));

        // 使用转换后的Map<String, List<Employee>>进行后续操作
        // ...
    }
}

class Person {
    private String name;
    private int age;

    // 构造函数、getter和setter方法省略
}

class Employee {
    private String name;
    private int age;

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

    // getter和setter方法省略
}