Java Array Max Value max(double[] array)

Description

Returns the maximum value in an array.

License

Open Source License

Parameter

Parameter	Description
array	an array, must not be null or empty

Exception

Parameter	Description
IllegalArgumentException	if <code>array</code> is empty

Return

the minimum value in the array

Declaration

public static double max(double[] array) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2011 MadRobot.//from w  w  w .  j  a  va  2s  . c  o  m
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v2.1
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * Contributors:
 *  Elton Kent - initial API and implementation
 ******************************************************************************/

public class Main {
    /**
    * <p>Gets the maximum of two <code>double</code> values.</p>
    * 
    * <p>NaN is only returned if all numbers are NaN as per IEEE-754r. </p>
    *
    * @param a  value 1
    * @param b  value 2
    * @return  the largest of the values
    */
    public static double max(double a, double b) {
        if (Double.isNaN(a)) {
            return b;
        } else if (Double.isNaN(b)) {
            return a;
        } else {
            return Math.max(a, b);
        }
    }

    /**
     * <p>Gets the maximum of three <code>double</code> values.</p>
     * 
     * <p>NaN is only returned if all numbers are NaN as per IEEE-754r. </p>
     *
     * @param a  value 1
     * @param b  value 2
     * @param c  value 3
     * @return  the largest of the values
     */
    public static double max(double a, double b, double c) {
        return max(max(a, b), c);
    }

    /**
     * <p>Returns the maximum value in an array.</p>
     * 
     * @param array  an array, must not be null or empty
     * @return the minimum value in the array
     * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
     * @throws IllegalArgumentException if <code>array</code> is empty
     */
    public static double max(double[] array) {
        // Validates input
        if (array == null) {
            throw new IllegalArgumentException("The Array must not be null");
        } else if (array.length == 0) {
            throw new IllegalArgumentException("Array cannot be empty.");
        }

        // Finds and returns max
        double max = array[0];
        for (int j = 1; j < array.length; j++) {
            max = max(array[j], max);
        }

        return max;
    }

    /**
     * <p>Gets the maximum of two <code>float</code> values.</p>
     * 
     * <p>NaN is only returned if all numbers are NaN as per IEEE-754r. </p>
     *
     * @param a  value 1
     * @param b  value 2
     * @return  the largest of the values
     */
    public static float max(float a, float b) {
        if (Float.isNaN(a)) {
            return b;
        } else if (Float.isNaN(b)) {
            return a;
        } else {
            return Math.max(a, b);
        }
    }

    /**
     * <p>Gets the maximum of three <code>float</code> values.</p>
     * 
     * <p>NaN is only returned if all numbers are NaN as per IEEE-754r. </p>
     *
     * @param a  value 1
     * @param b  value 2
     * @param c  value 3
     * @return  the largest of the values
     */
    public static float max(float a, float b, float c) {
        return max(max(a, b), c);
    }

    /**
     * <p>Returns the maximum value in an array.</p>
     * 
     * @param array  an array, must not be null or empty
     * @return the minimum value in the array
     * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
     * @throws IllegalArgumentException if <code>array</code> is empty
     */
    public static float max(float[] array) {
        // Validates input
        if (array == null) {
            throw new IllegalArgumentException("The Array must not be null");
        } else if (array.length == 0) {
            throw new IllegalArgumentException("Array cannot be empty.");
        }

        // Finds and returns max
        float max = array[0];
        for (int j = 1; j < array.length; j++) {
            max = max(array[j], max);
        }

        return max;
    }
}

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