/* Example suggested by Dr. Nowling */
package class1_1_Microbenchmark_start;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class SpeedTest {
    private static final int NUM_PEOPLE = 1_000_000;
    public static final int NANOS_PER_UNIT = 1_000_000_000;

    public static void main(String[] args) {
        List<Double> line = new ArrayList<>();
        long startTime = System.nanoTime();
        irs(line);
        System.out.println("Total time: "+
                ((double)(System.nanoTime()-startTime)/NANOS_PER_UNIT) +  "s ");
    }

    private static void irs(List<Double> line) {
        Random personGenerator = new Random();
        for(int i = 0; i < NUM_PEOPLE; i++) {
            getInLine(personGenerator.nextDouble(), line);
        }
        for(int i = 0; i < NUM_PEOPLE; i++) {
            serveNext(line);
        }
    }

    private static void serveNext(List<Double> line) {
        line.remove(line.size()-1);
    }

    private static void getInLine(double person, List<Double> line) {
        line.add(person);
    }
}