如何在Java中对个性化对象使用flatmap

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Main {
    public static void main(String[] args) {
        // 创建个性化对象的集合
        List<Person> persons = Arrays.asList(
                new Person("Alice", Arrays.asList("Java", "Python")),
                new Person("Bob", Arrays.asList("C++", "JavaScript")),
                new Person("Charlie", Arrays.asList("Java", "Ruby"))
        );

        // 对个性化对象使用flatMap
        List<String> languages = persons.stream()
                .flatMap(person -> person.getLanguages().stream())
                .distinct()
                .collect(Collectors.toList());

        // 输出结果
        System.out.println(languages);
    }
}

class Person {
    private String name;
    private List<String> languages;

    public Person(String name, List<String> languages) {
        this.name = name;
        this.languages = languages;
    }

    public List<String> getLanguages() {
        return languages;
    }
}

[Java, Python, C++, JavaScript, Ruby]