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package optjava;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Random;

// tag::CLASSIC_SORT[]

public class ClassicSort {

private static final int NUM_ITEMS = 100_000;

private static final int ITERATIONS = 300_000;

private static final List<Integer> testData = new ArrayList<>();

public static void main(String[] args) {

Random randomGenerator = new Random();

for (int i = 0; i < NUM_ITEMS; i++) {

testData.add(randomGenerator.nextInt(Integer.MAX_VALUE));

}

System.out.println("Testing Sort Algorithm");

double startTime = System.nanoTime();

for (int i = 0; i < ITERATIONS; i++) {

List<Integer> copy = new ArrayList<>(testData);

Collections.sort(copy);

}

double endTime = System.nanoTime();

double timePerOperation = ((endTime - startTime) / (NUM_ITEMS * ITERATIONS));

System.out.println("Result: " + (1 / timePerOperation) + " op/s");

}

}

// end::CLASSIC_SORT[]