Here you can find the source of align(int size, int align)
public static int align(int size, int align)
//package com.java2s; /*//from ww w . jav a 2 s .co m * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ public class Main { public static int align(int size, int align) { assert isPowerOf2(align); return (size + align - 1) & ~(align - 1); } /** * Checks whether the specified integer is a power of two. * * @param val the value to check * @return {@code true} if the value is a power of two; {@code false} otherwise */ public static boolean isPowerOf2(int val) { return val != 0 && (val & val - 1) == 0; } /** * Checks whether the specified long is a power of two. * * @param val the value to check * @return {@code true} if the value is a power of two; {@code false} otherwise */ public static boolean isPowerOf2(long val) { return val != 0 && (val & val - 1) == 0; } }