Assertj验证集合中每个项的字段是否始终为空

import org.assertj.core.api.Assertions;
import java.util.List;

public class CollectionAssertion {
    public static void main(String[] args) {
        List<Person> persons = List.of(
                new Person("John", null),
                new Person("Alice", null),
                new Person("Bob", null)
        );

        Assertions.assertThat(persons)
                .extracting(Person::getField)
                .allMatch(field -> field == null);
    }

    static class Person {
        private String name;
        private String field;

        public Person(String name, String field) {
            this.name = name;
            this.field = field;
        }

        public String getField() {
            return field;
        }
    }
}