package com.dj;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Comparator;

import java.util.List;

public class Main {

record Person(String firstName, String lastName) {

@Override

public String toString() {

return firstName + " " + lastName;

}

}

public static void main(String[] args) {

List<Person> people = new ArrayList<>(Arrays.asList(

new Main.Person("Lucy", "Van Pelt"),

new Person("Sally", "Brown"),

new Person("Linus", "Van Pelt"),

new Person("Peppermint", "Patty"),

new Person("Charlie", "Brown")

));

//Using anonymous class

var comparatorLastName = new Comparator<Person>() {

@Override

public int compare(Person o1, Person o2) {

return o1.lastName.compareTo(o2.lastName);

}

};

people.sort((o1, o2) -> o1.lastName.compareTo(o2.lastName));

System.out.println(people);

interface EnhancedComparator<T> extends Comparator<T> {

int secondLevel(T o1, T o2);

}

var comparatorMixed = new EnhancedComparator<Person>() {

@Override

public int compare(Person o1, Person o2) {

int result = o1.lastName().compareTo(o2.lastName());

return (result == 0 ? secondLevel(o1, o2) : result);

}

@Override

public int secondLevel(Person o1, Person o2) {

return o1.firstName().compareTo(o2.firstName());

}

};

people.sort(comparatorMixed);

System.out.println(people);

}

}