Average.java

/*
 * Copyright 2014 Kevin Raoofi.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package edu.frostburg.cosc310.skraoofi0.benchmarking;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.RoundingMode;
import java.util.Arrays;
import java.util.Random;

public class Average {

    static BigInteger bi = BigInteger.ZERO;

    public static void main(String... args) {
        Random r = new Random(0);
        double avg = 0;
        long count = 0;

        long[] data = new long[1024];

        for (int i = 0; i < data.length; i++) {
            data[i] = Math.abs(r.nextLong());
        }

        for (int i = 0; i < data.length; i++) {
            avg += ((double) data[i]) / (data.length);
        }

        System.out.println("Average 1: " + avg);

        for (int i = 0; i < data.length; i++) {
            count += data[i];
        }

        System.out.println("Average 2: " + count / data.length);
        System.out.println("Average 3: " + Arrays.stream(data).average().getAsDouble());
        Arrays.stream(data).forEach((l) -> {
            bi = bi.add(new BigInteger(Long.toString(l)));
        });

        BigDecimal bd = new BigDecimal(bi);
        bd = bd.divide(new BigDecimal(data.length), RoundingMode.UP);
        System.out.println("Average 4: " + bd);
    }
}