Here you can find the source of getMaximumMemory()
public static long getMaximumMemory()
//package com.java2s; /*/*from w w w . j a va 2 s . co m*/ This file is part of PSFj. PSFj 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. PSFj 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 PSFj. If not, see <http://www.gnu.org/licenses/>. Copyright 2013,2014 Cyril MONGIS, Patrick Theer, Michael Knop */ public class Main { public static long getMaximumMemory() { return Runtime.getRuntime().maxMemory() / 1024 / 1024; } }