Here you can find the source of max(List extends Number> values)
public static double max(List<? extends Number> values)
//package com.java2s; /*// ww w.jav a 2 s . c om * Copyright 2016 Roche NimbleGen 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. */ import java.util.List; public class Main { /** * @param values * @return the max of all provided values */ public static double max(double... values) { double max = -Double.MAX_VALUE; for (double value : values) { if (value > max) { max = value; } } return max; } /** * @param values * @return the max of all provided values */ public static long max(long... values) { long max = -Long.MAX_VALUE; for (long value : values) { if (value > max) { max = value; } } return max; } /** * @param values * @return the max of all provided values */ public static int max(int... values) { int max = Integer.MIN_VALUE; for (int value : values) { if (value > max) { max = value; } } return max; } /** * @param values * @return the max of all provided values */ public static int max(int[]... values) { int max = Integer.MIN_VALUE; for (int[] rows : values) { for (int value : rows) { if (value > max) { max = value; } } } return max; } public static double max(List<? extends Number> values) { double max = Integer.MIN_VALUE; for (Number value : values) { if (value.doubleValue() > max) { max = value.doubleValue(); } } return max; } }