Here you can find the source of max(final Iterable extends Number> numbers)
static double max(final Iterable<? extends Number> numbers)
//package com.java2s; /*//from www . j a v a2 s . co m * Copyright 2004-2005 Revolution Systems Inc. * * 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. */ public class Main { static double max(final double... values) { double max = -Double.MAX_VALUE; for (final double value : values) { if (value > max) { max = value; } } return max; } static int max(final int... values) { int max = Integer.MIN_VALUE; for (final int value : values) { if (value > max) { max = value; } } return max; } static double max(final Iterable<? extends Number> numbers) { double max = -Double.MAX_VALUE; for (final Number number : numbers) { final double value = number.doubleValue(); if (value > max) { max = value; } } return max; } }