Java 8:根据条件遍历列表并添加到映射

import java.util.*;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        List<Person> personList = Arrays.asList(
                new Person("Alice", 20),
                new Person("Bob", 25),
                new Person("Charlie", 17),
                new Person("David", 30)
        );

        Map<String, Integer> resultMap = personList.stream()
                .filter(person -> person.getAge() >= 18) // 根据条件过滤
                .collect(Collectors.toMap(Person::getName, Person::getAge)); // 创建映射

        System.out.println(resultMap);
    }
}

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;
    }
}

{Alice=20, Bob=25, David=30}