Challenge: Selecting the Best Cars on the Production Line

Task

Swipe to start coding

At the factory, you need to process a list of cars, filter them based on mileage, sort them according to specific criteria, and display the results.

Each car is represented by the Car class, which contains an id as a unique identifier, a model specifying the car’s name, a year indicating when it was manufactured, and a mileage field representing the total distance it has traveled.

Filter the cars, keeping only those with a mileage of 30,000 miles or less using the filter() method.
Sort the cars by year in ascending order using comparingInt() method.
Once the cars are sorted by year, reverse the order to have the newest cars first using reversed() method.
If two cars have the same year, sort them by mileage in ascending order using thenComparing() method.
Convert each car object to a string representation, using the toString() method.
Print the final list to the console, using a method reference to println().

Solution

solution

package com.example;

import java.util.List;

import java.util.Comparator;

public class Main {

public static void main(String[] args) {

List<Car> cars = List.of(

new Car(1, "Toyota Camry", 2022, 12000),

new Car(2, "Ford Mustang", 2020, 45000),

new Car(3, "Tesla Model 3", 2022, 6000),

new Car(4, "Chevrolet Malibu", 2019, 32000),

new Car(5, "Honda Accord", 2020, 25000)

);

List<String> processedCars = cars.stream()

.filter(car -> car.getMileage() <= 30000)

.sorted(Comparator.comparingInt(Car::getYear).reversed()

.thenComparingInt(Car::getMileage))

.map(Car::toString)

.toList();

processedCars.forEach(System.out::println);

}

class Car {

private int id;

private String model;

private int year;

private int mileage;

public Car(int id, String model, int year, int mileage) {

this.id = id;

this.model = model;

this.year = year;

Everything was clear?

Thanks for your feedback!

Section 2. Chapter 6