Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.Comparator;

public class Main {
    public static void main(String... args) {
        // Comparators
        Comparator<Person> comparator = (p1, p2) -> p1.firstName.compareTo(p2.firstName);

        Person p1 = new Person("A", "Z");
        Person p2 = new Person("B", "Z");

        System.out.println(comparator.compare(p1, p2));// > 0
        System.out.println(comparator.reversed().compare(p1, p2)); // < 0

    }
}

class Person {
    String firstName;
    String lastName;

    Person() {
    }

    Person(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }
}