Here you can find the source of getUsedMemoryInMegabytes()
public static int getUsedMemoryInMegabytes()
//package com.java2s; /*/*from w w w.j a va2 s. co m*/ * Copyright 2015 Laszlo Balazs-Csiki * * This file is part of Pixelitor. Pixelitor is free software: you * can redistribute it and/or modify it under the terms of the GNU * General Public License, version 3 as published by the Free * Software Foundation. * * Pixelitor 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 Pixelitor. If not, see <http://www.gnu.org/licenses/>. */ public class Main { private static final int BYTES_IN_1_MEGABYTE = 1048576; public static int getUsedMemoryInMegabytes() { long usedMemory = Runtime.getRuntime().totalMemory(); int sizeInMegaBytes = (int) (usedMemory / BYTES_IN_1_MEGABYTE); return sizeInMegaBytes; } }