.sorted关键字进行比较排序

package q;
 
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
 
import java.util.ArrayList;
import java.util.List;
import java.util.Comparator;
import java.util.stream.Collectors;
 
public class StreamTest {
    public static void main(String[] args) {
        Person person1 = new Person();
        person1.setAge(21);
        person1.setName("21");
 
        Person person2 = new Person();
        person2.setAge(19);
        person2.setName("19");
 
        Person person3 = new Person();
        person3.setAge(19);
        person3.setName("20");
 
        Person person4 = new Person();
        person4.setAge(20);
        person4.setName("20");
 
        Person person5 = new Person();
        person5.setAge(19);
        person5.setName("18");
 
        List<Person> people = new ArrayList<>();
        people.add(person1);
        people.add(person2);
        people.add(person3);
        people.add(person4);
        people.add(person5);
 
        List<Person> collect1 = people.stream().sorted((Comparator.comparing(Person::getAge))).collect(Collectors.toList());//只根据年龄排序，升序
        System.out.println(collect1);
 
        List<Person> collect2 = people.stream().sorted((Comparator.comparing(Person::getAge)).reversed()).collect(Collectors.toList());//只根据年龄排序，降序
        System.out.println(collect2);
 
        List<Person> collect3 = people.stream().sorted((Comparator.comparing(Person::getAge)).thenComparing(Comparator.comparing(Person::getName))).collect(Collectors.toList());//先根据年龄进行排序，遇见相同的，然后根据姓名进行排序，都升序
        System.out.println(collect3);
 
        List<Person> collect4 = people.stream().sorted((Comparator.comparing(Person::getAge)).thenComparing(Comparator.comparing(Person::getName)).reversed()).collect(Collectors.toList());//先根据年龄进行排序，遇见相同的，然后根据姓名进行排序，降序【都降序】
        System.out.println(collect4);
 
        List<Person> collect5 = people.stream().sorted(Comparator.comparing(Person::getAge).reversed().thenComparing(Comparator.comparing(Person::getName)).reversed()).collect(Collectors.toList());//年龄升序，姓名降序
        System.out.println(collect5);
 
        List<Person> collect6 = people.stream().sorted(Comparator.comparing(Person::getAge).reversed().thenComparing(Comparator.comparing(Person::getName))).collect(Collectors.toList());//根据年龄降序，姓名升序
        System.out.println(collect6);
    }
}
 
@Data
@NoArgsConstructor
@ToString
class Person {
    private String name;
    private Integer age;
}