使用Java Stream ==进行过滤>将自定义对象的HashMap转换为HashSet

HashMap<Integer, Person> personMap = new HashMap<>();
personMap.put(1, new Person("Alice", 25));
personMap.put(2, new Person("Bob", 30));
personMap.put(3, new Person("Charlie", 35));

HashSet<Person> personSet = personMap.values().stream()
                        .filter(person -> person.getAge() > 30)
                        .collect(Collectors.toCollection(HashSet::new));

import java.util.HashMap;
import java.util.HashSet;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        HashMap<Integer, Person> personMap = new HashMap<>();
        personMap.put(1, new Person("Alice", 25));
        personMap.put(2, new Person("Bob", 30));
        personMap.put(3, new Person("Charlie", 35));

        HashSet<Person> personSet = personMap.values().stream()
                .filter(person -> person.getAge() > 30)
                .collect(Collectors.toCollection(HashSet::new));

        for (Person person : personSet) {
            System.out.println(person.getName() + " - " + person.getAge());
        }
    }

    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;
        }
    }
}

Charlie - 35