Java8 -从匹配搜索条件的对象中获取实例变量值的列表(字段名列表)

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

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", 35));

        List<String> names = persons.stream()
                .filter(person -> person.getAge() > 30) // 筛选年龄大于30的对象
                .map(Person::getName) // 获取对象的姓名
                .collect(Collectors.toList()); // 收集结果到列表

        System.out.println(names); // 输出结果：[Charlie]
    }

    static 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;
        }
    }
}