NetUtils { public static boolean isAnyHost(String host) { return ANYHOST_VALUE.equals(host); }  static int getRandomPort(); static int getAvailablePort(); static int getAvailablePort(int port); static boolean isInvalidPort(int port); static boolean isValidAddress(String address); static boolean isLocalHost(String host); static boolean isAnyHost(String host); static boolean isInvalidLocalHost(String host); static boolean isValidLocalHost(String host); static InetSocketAddress getLocalSocketAddress(String host, int port); static String getLocalHost(); static String filterLocalHost(String host); static String getIpByConfig(); static InetAddress getLocalAddress(); static boolean isPreferredNetworkInterface(NetworkInterface networkInterface); static NetworkInterface findNetworkInterface(); static String getHostName(String address); static String getIpByHost(String hostName); static String toAddressString(InetSocketAddress address); static InetSocketAddress toAddress(String address); static String toURL(String protocol, String host, int port, String path); static void joinMulticastGroup(MulticastSocket multicastSocket, InetAddress multicastAddress); static void setInterface(MulticastSocket multicastSocket, boolean preferIpv6); static boolean matchIpExpression(String pattern, String host, int port); static boolean matchIpRange(String pattern, String host, int port); static boolean isMulticastAddress(String host);  }
@Test public void testIsAnyHost() throws Exception { assertTrue(NetUtils.isAnyHost("0.0.0.0")); assertFalse(NetUtils.isAnyHost("1.1.1.1")); }