Here you can find the source of maxIntValue(ArrayList
final static Integer maxIntValue(ArrayList<Integer> ints)
//package com.java2s; /**//from ww w. j av a 2 s . c o m * Copyright (C) 2013 Daniel Jameson This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>. */ import java.util.*; public class Main { final static Integer maxIntValue(ArrayList<Integer> ints) { Integer maxValue = Integer.MIN_VALUE; Iterator<Integer> iter = ints.iterator(); while (iter.hasNext()) { maxValue = Math.max(iter.next(), maxValue); } return maxValue; } }