Objects are in ascending or descending order based on a certain attribute.

It only sorts by the id in the object. It can also be implemented if it is in ascending or descending order of other fields. [Java]/*** sort personal information ** @ author wWX154783 **/public class PersonSort {public static void main (String [] args) {List <Person> list = new ArrayList <Person> (); for (int I = 0; I <10; I ++) {Person person = new Person (); person. setId (new Random (). nextInt (50); list. add (person);} System. out. println ("Original: \ t" + list); Collections. sort (list, new PersonOrderByIdAsc (); System. out. println ("Ascending Order: \ t" + list); Collections. sort (list, new PersonOrderByIdDesc (); System. out. println ("descending order: \ t" + list); }}/ * Person */class Person implements Comparator <Person> {private int id; private int age; private String name; private String sex; private String address; public int compare (Person o1, Person o2) {return 0;} public int getId () {return id;} public void setId (int id) {this. id = id;} public String getName () {return name;} public void setName (String name) {this. name = name;} public int getAge () {return age;} public void setAge (int age) {this. age = age;} public String getSex () {return sex;} public void setSex (String sex) {this. sex = sex;} public String getAddress () {return address;} public void setAddress (String address) {this. address = address ;}@ Override public String toString () {return "id =" + this. id ;}}/* sort by person id in ascending order */class PersonOrderByIdAsc extends Person {@ Override public int compare (Person o1, Person o2) {if (o1.getId ()> o2.getId () {return 1;} else if (o1.getId () <o2.getId () {return-1 ;}else {return 0 ;}}} /* sort by person id in descending order */class PersonOrderByIdDesc extends Person {@ Override public int compare (Person o1, Person o2) {if (o1.getId () <o2.getId ()) {return 1 ;}else if (o1.getId ()> o2.getId () {return-1 ;}else {return 0 ;}}}