AutonomousCarTester.java

import java.util.Scanner;

public class AutonomousCarTester {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        System.out.println("How many cars to enter? ");
        int size = scan.nextInt();

        while (size <= 0) {
            System.out.println("Enter a positive non-negative integer!");
            System.out.println("How many cars to enter? ");
            size = scan.nextInt();
        }

        AutonomousCar[] carsArray = new AutonomousCar[size];
        for (int i = 0; i < carsArray.length; i++) {
            System.out.print("Enter car id: ");
            int id = scan.nextInt();
            System.out.print("Enter brand: ");
            String brand = scan.next();
            System.out.print("Enter # of tests conducted on car: ");
            int testsNo = scan.nextInt();
            System.out.print("Enter # of tests passed: ");
            int testsPassedNo = scan.nextInt();
            System.out.print("Enter environment: ");
            String env = scan.next();

            carsArray[i] = new AutonomousCar(id, brand, testsNo, testsPassedNo, env);
        }
        System.out.println("Enter brand to search for: ");
        String brandToSearchFor = scan.next();

        System.out.print("Enter environment to search for: ");
        String environ = scan.next();

        if (findTestPassedByEnv(carsArray,environ) == 0) {
            System.out.println("There are no tests passed in this particular environment.");
        } else {
            System.out.println(findTestPassedByEnv(carsArray,environ));
        }

        AutonomousCar var = updateCarGrade(brandToSearchFor,carsArray);
        if (var != null) {
            System.out.printf("%s::%s\n", var.getBrand(), var.getGrade());
        } else {
            System.out.println("No car is available with specified brand.");
        }
    } // end main()

    public static int findTestPassedByEnv(AutonomousCar[] ar, String environment) {
        int sum = 0;
        if (ar.length == 0) {
            return sum;
        } else {
            int result = 0;
            for (AutonomousCar autonomousCar : ar) {
                if (autonomousCar.getEnvironment().equalsIgnoreCase(environment)) {
                    int noOfTestsPassed = autonomousCar.getNoOfTestsPassed();
                    result += noOfTestsPassed;
                }
            }
            sum = result;
        }
        return sum;
    } // end findTestPassedByEnv()

    public static AutonomousCar updateCarGrade(String brand, AutonomousCar[] ar) {
        AutonomousCar aCar = null;

        if (ar.length == 0) {
            return null;
        } else {
            for (AutonomousCar autonomousCar : ar) {
                if (autonomousCar != null && autonomousCar.getBrand().equalsIgnoreCase(brand)) {
                    int rating =
                            (autonomousCar.getNoOfTestsPassed() * 100) / autonomousCar.getNoOfTestsConducted();

                    String grade;
                    if (rating >= 80) {
                        grade = "A1";
                    } else {
                        grade = "B2";
                    }
                    autonomousCar.setGrade(grade);
                } // end outer if
                aCar = autonomousCar;
            } // end for
        } // end outer else
        return aCar;
    } // end updateCarGrade()


} // end class