Java Array Average average(double[] values)

Description

Returns the average (mean) of the given values.

License

Apache License

Parameter

Parameter	Description
values	an array of values

Return

the average as a double value

Declaration

public static double average(double[] values) 

Method Source Code

//package com.java2s;
/**/*from  ww  w .j  ava2s  .  co m*/
 * Copyright 2014 SAP AG
 *
 * 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.
 */

import java.util.Collection;

public class Main {
    /**
     * Returns the average (mean) of the given values.
     * 
     * @param values
     *            a collection of values
     * @return the average as a double value
     */
    public static double average(Collection<? extends Number> values) {
        double result = 0;

        if (values == null) {
            throw new IllegalArgumentException(
                    "Cannot calculate average on a null object.");
        }

        if (values.size() == 0) {
            return 0;
        } else {
            for (Number n : values) {
                result += n.doubleValue();
            }
        }

        return result / values.size();
    }

    /**
     * Returns the average (mean) of the given values.
     * 
     * @param values
     *            an array of values
     * @return the average as a double value
     */
    public static double average(double[] values) {
        double result = 0;

        if (values == null) {
            throw new IllegalArgumentException(
                    "Cannot calculate average on a null object.");
        }

        if (values.length == 0) {
            return 0;
        } else {
            for (Number n : values) {
                result += n.doubleValue();
            }
        }

        return result / values.length;

    }
}

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