Main.java

package modern.challenge;

import java.time.Clock;
import java.util.Comparator;
import java.util.concurrent.TimeUnit;

public class Main {

    public static void main(String[] args) {

        Clock clock = Clock.systemUTC();

        // array of numbers                
        int[] numbers = new int[]{4, 5, 1, 3, 7, 4, 1, 5};

        // array of Melon
        Melon[] melons = new Melon[]{
            new Melon("Crenshaw", 2000), new Melon("Gac", 1200), new Melon("Bitter", 2200)};

        // Comparators        
        Comparator<Melon> byType = Comparator.comparing(Melon::getType);
        Comparator<Melon> byWeight = Comparator.comparing(Melon::getWeight);

        System.out.println("Check only for presence:");
        System.out.println("------------------------");

        System.out.println("\nSimple solution for numbers:");
        long startTimeV1 = clock.millis();
        boolean found1 = ArraySearch.containsElementV1(numbers.clone(), 1);
        displayExecutionTime(clock.millis() - startTimeV1);
        System.out.println("The element was found?: " + found1);

        System.out.println("\nSolution based on Arrays.binarySearch() for numbers:");
        long startTimeV2 = clock.millis();
        boolean found2 = ArraySearch.containsElementV2(numbers.clone(), 1);
        displayExecutionTime(clock.millis() - startTimeV2);
        System.out.println("The element was found?: " + found2);

        System.out.println("\nSolution based on Stream.anyMatch() for numbers:");
        long startTimeV3 = clock.millis();
        boolean found3 = ArraySearch.containsElementV3(numbers.clone(), 1);
        displayExecutionTime(clock.millis() - startTimeV3);
        System.out.println("The element was found?: " + found3);

        System.out.println("\nSimple solution for Melon:");
        long startTimeV4 = clock.millis();
        boolean found4 = ArraySearch.containsElementObjectV1(melons.clone(), new Melon("Gac", 1200));
        displayExecutionTime(clock.millis() - startTimeV4);
        System.out.println("The Melon was found?: " + found4);

        System.out.println("\nSolution based on Comparator for Melon:");
        long startTimeV5 = clock.millis();
        boolean found5 = ArraySearch.containsElementObjectV2(melons.clone(), new Melon("Gac", 1205), byType);
        displayExecutionTime(clock.millis() - startTimeV5);
        System.out.println("The Melon was found?: " + found5);

        System.out.println("\nSolution based on binarySearch() for Melon:");
        long startTimeV6 = clock.millis();
        boolean found6 = ArraySearch.containsElementObjectV3(melons.clone(), new Melon("Honeydew", 1200), byWeight);
        displayExecutionTime(clock.millis() - startTimeV6);
        System.out.println("The Melon was found?: " + found6);

        System.out.println("\nCheck only for index:");
        System.out.println("---------------------");

        System.out.println("\nSimple solution for numbers:");
        long startTimeV7 = clock.millis();
        int index1 = ArraySearch.findIndexOfElementV1(numbers.clone(), 7);
        displayExecutionTime(clock.millis() - startTimeV7);
        System.out.println("Found at index (-1 means not found): " + index1);

        System.out.println("\nSolution based on filter() for numbers:");
        long startTimeV8 = clock.millis();
        int index2 = ArraySearch.findIndexOfElementV2(numbers.clone(), 7);
        displayExecutionTime(clock.millis() - startTimeV8);
        System.out.println("Found at index (-1 means not found): " + index2);

        System.out.println("\nSimple solution for Melon:");
        long startTimeV9 = clock.millis();
        int index3 = ArraySearch.findIndexOfElementObjectV1(melons.clone(), new Melon("Gac", 1200));
        displayExecutionTime(clock.millis() - startTimeV9);
        System.out.println("Melon found at index (-1 means not found): " + index3);

        System.out.println("\nSolution based on Comparator for Melon:");
        long startTimeV10 = clock.millis();
        int index4 = ArraySearch.findIndexOfElementObjectV2(melons.clone(), new Melon("Gac", 1205), byType);
        displayExecutionTime(clock.millis() - startTimeV10);
        System.out.println("Melon found at index (-1 means not found): " + index4);

        System.out.println("\nSolution based on filter() and Comparator for Melon:");
        long startTimeV11 = clock.millis();
        int index5 = ArraySearch.findIndexOfElementObjectV3(melons.clone(), new Melon("Honeydew", 1200), byWeight);
        displayExecutionTime(clock.millis() - startTimeV11);
        System.out.println("Melon found at index (-1 means not found): " + index5);
    }

    private static void displayExecutionTime(long time) {
        System.out.println("Execution time: " + time + " ms" + " ("
                + TimeUnit.SECONDS.convert(time, TimeUnit.MILLISECONDS) + " s)");
    }
}