Java Collection Mean calculateMean(Collection values)

Description

Calculate a mean for the input

License

Open Source License

Parameter

Parameter	Description
values	the values we're calculating a mean for

Exception

Parameter	Description
IllegalArgumentException	if the size of the input is empty

Return

a mean value

Declaration

public static double calculateMean(Collection<? extends Number> values) throws IllegalArgumentException 

Method Source Code

//package com.java2s;
/*/*  w ww. j  a va 2 s.c  o m*/
 * Copyright (c) 2010 The Jackson Laboratory
 * 
 * This is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.Collection;

public class Main {
    /**
     * Calculate a mean for the input
     * @param values
     *          the values we're calculating a mean for
     * @return
     *          a mean value
     * @throws IllegalArgumentException
     *          if the size of the input is empty
     */
    public static double calculateMean(Collection<? extends Number> values) throws IllegalArgumentException {
        if (values.isEmpty()) {
            throw new IllegalArgumentException("can't calculate a mean for an empty collection");
        } else {
            double sum = 0.0;
            for (Number currValue : values) {
                sum += currValue.doubleValue();
            }
            return sum / values.size();
        }
    }

    /**
     * Calculate a mean for the input
     * @param values
     *          the values we're calculating a mean for
     * @return
     *          a mean value
     * @throws IllegalArgumentException
     *          if the size of the input is empty
     */
    public static double calculateMean(double[] values) throws IllegalArgumentException {
        if (values.length == 0) {
            throw new IllegalArgumentException("can't calculate a mean for an empty list");
        } else {
            double sum = 0.0;
            for (Number currValue : values) {
                sum += currValue.doubleValue();
            }
            return sum / values.length;
        }
    }
}

Related

1. calculateMean(Collection values)
2. calculateMean(Collection values)
3. getMean(Collection data)
4. getMean(Collection cluster)
5. getMean(final Collection collection)