Array copy benchmark

ArrayCopierBenchmark.java

package fr.amadeus.ws.pricexplorer;

import com.google.common.base.Stopwatch;

import java.util.Arrays;

/**
 * Array copy benchmark
 * java -cp . -Xint ArrayCopierBenchmark performance 250000
 */
public class ArrayCopierBenchmark {

    public static void main(String... arguments) {
        final int iterations = Integer.parseInt(arguments[1]);
        processArrayCopies(iterations);
    }

    /**
     * Display the time it takes to copy an array in various ways.
     */
    private static void processArrayCopies(int iterations) {
        Stopwatch stopwatch = new Stopwatch();
        int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

        /* Copy by .clone() */
        stopwatch.start();
        copyUsingClone(numbers, iterations);
        stopwatch.stop();
        log("Using clone: " + stopwatch);

       /* Copy by  System.arraycopy() */
        stopwatch.start();
        copyUsingArraycopy(numbers, iterations);
        stopwatch.stop();
        log("Using System.arraycopy: " + stopwatch);

        /* Copy by Arrays.copyOf() */
        stopwatch.start();
        copyUsingArraysCopyOf(numbers, iterations);
        stopwatch.stop();
        log("Using Arrays.copyOf: " + stopwatch);

        /* Copy by loop */
        stopwatch.start();
        copyUsingForLoop(numbers, iterations);
        stopwatch.stop();
        log("Using for loop: " + stopwatch);
    }

    /**
     * Copy by .clone()
     */
    private static void copyUsingClone(int[] array, int iterations) {
        for (int idx = 0; idx < iterations; ++idx) {

            int[] copy = (int[]) array.clone();

        }
    }

    /**
     * Copy by  System.arraycopy()
     */
    private static void copyUsingArraycopy(int[] array, int iterations) {
        for (int i = 0; i < iterations; ++i) {

            int[] copy = new int[array.length];
            System.arraycopy(array, 0, copy, 0, array.length);

        }
    }

    /**
     * Copy by Arrays.copyOf()
     */
    private static void copyUsingArraysCopyOf(int[] array, int iterations) {
        for (int i = 0; i < iterations; ++i) {

            int[] copy = Arrays.copyOf(array, array.length);

        }
    }

    /**
     * Copy by loop
     */
    private static void copyUsingForLoop(int[] array, int iterations) {
        for (int i = 0; i < iterations; ++i) {

            int[] copy = new int[array.length];
            for (int idx = 0; idx < array.length; ++idx) {
                copy[idx] = array[idx];
            }

        }
    }

    private static void log(String message) {
        System.out.println(message);
    }

}