Here you can find the source of toBytes4(int n)
public static byte[] toBytes4(int n)
//package com.java2s; /*//from w w w . j a va2 s . c om (c) copyright This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ public class Main { public static byte[] toBytes4(int n) { byte[] b = new byte[4]; b[0] = (byte) (n); n >>>= 8; b[1] = (byte) (n); n >>>= 8; b[2] = (byte) (n); n >>>= 8; b[3] = (byte) (n); return b; } }