Java tutorial
//package com.java2s; /* * $Id: SubnetUtil.java 888 2013-06-14 06:21:33Z t-nakaguchi $ * * This is a program for Language Grid Core Node. This combines multiple language resources and provides composite language services. * Copyright (C) 2005-2013 NICT Language Grid Project. * * This program 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 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 Lesser * General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.net.InetAddress; import java.net.UnknownHostException; public class Main { static InetAddress parseLinuxSubnetMask(String line) throws UnknownHostException { int e = line.indexOf("broadcast"); if (e == -1) return null; e--; String v = line.substring(line.indexOf("netmask") + 8, e); if (v.startsWith("0x")) { try { long address = Long.parseLong(v.substring(2), 16); return InetAddress.getByAddress(new byte[] { (byte) (address >> 24), (byte) ((address >> 16) & 0xff), (byte) ((address >> 8) & 0xff), (byte) (address & 0xff) }); } catch (NumberFormatException e2) { } } else { return InetAddress.getByName(v); } return null; } }