Java合并2个集合，同时根据特定字段比较和保留对象

import java.util.ArrayList;
import java.util.List;

public class MergeCollections {
    public static void main(String[] args) {
        List<Person> list1 = new ArrayList<>();
        list1.add(new Person("John", 25));
        list1.add(new Person("Amy", 30));
        list1.add(new Person("Tom", 35));

        List<Person> list2 = new ArrayList<>();
        list2.add(new Person("Amy", 28));
        list2.add(new Person("Tom", 32));
        list2.add(new Person("Kate", 40));

        List<Person> mergedList = mergeCollections(list1, list2);

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

    public static List<Person> mergeCollections(List<Person> list1, List<Person> list2) {
        List<Person> mergedList = new ArrayList<>(list1);

        for (Person person2 : list2) {
            boolean found = false;

            for (Person person1 : mergedList) {
                if (person1.getName().equals(person2.getName())) {
                    found = true;
                    if (person2.getAge() > person1.getAge()) {
                        person1.setAge(person2.getAge());
                    }
                    break;
                }
            }

            if (!found) {
                mergedList.add(person2);
            }
        }

        return mergedList;
    }

    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;
        }

        public void setAge(int age) {
            this.age = age;
        }
    }
}