Here you can find the source of compareInetAddresses(InetAddress a1, InetAddress a2)
public static int compareInetAddresses(InetAddress a1, InetAddress a2)
//package com.java2s; /**/*from w ww . j a v a 2s.co m*/ * NetXMS - open source network management system * Copyright (C) 2003-2015 Victor Kirhenshtein * * This program 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 2 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ import java.net.Inet4Address; import java.net.Inet6Address; import java.net.InetAddress; public class Main { public static int compareInetAddresses(InetAddress a1, InetAddress a2) { if (a1 == null) return (a2 == null) ? 0 : -1; if (a2 == null) return 1; if ((a1 instanceof Inet4Address) && (a2 instanceof Inet6Address)) return -1; if ((a1 instanceof Inet6Address) && (a2 instanceof Inet4Address)) return 1; byte[] b1 = a1.getAddress(); byte[] b2 = a2.getAddress(); int length = Math.min(b1.length, b2.length); for (int i = 0; i < length; i++) { int n1 = (int) b1[i] & 0xFF; int n2 = (int) b2[i] & 0xFF; if (n1 < n2) return -1; if (n1 > n2) return 1; } return b1.length - b2.length; } }