text: /*
   * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
   * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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  package java.net;
  import java.io.IOException;
  
  /*
   * Package private implementation of InetAddressImpl for IPv4.
   *
   * @since 1.4
   */
  class Inet4AddressImpl implements InetAddressImpl {
      public native String getLocalHostName() throws UnknownHostException;
      public native InetAddress[]
          lookupAllHostAddr(String hostname) throws UnknownHostException;
      public native String getHostByAddr(byte[] addr) throws UnknownHostException;
      private native boolean isReachable0(byte[] addr, int timeout, byte[] ifaddr, int ttl) throws IOException;
  
      public synchronized InetAddress anyLocalAddress() {
          if (anyLocalAddress == null) {
              anyLocalAddress = new Inet4Address(); // {0x00,0x00,0x00,0x00}
              anyLocalAddress.holder().hostName = "0.0.0.0";
          }
          return anyLocalAddress;
      }
  
      public synchronized InetAddress loopbackAddress() {
          if (loopbackAddress == null) {
              byte[] loopback = {0x7f,0x00,0x00,0x01};
              loopbackAddress = new Inet4Address("localhost", loopback);
          }
          return loopbackAddress;
      }
  
    public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException {
        byte[] ifaddr = null;
        if (netif != null) {
            /*
             * Let's make sure we use an address of the proper family
             */
            java.util.Enumeration<InetAddress> it = netif.getInetAddresses();
            InetAddress inetaddr = null;
            while (!(inetaddr instanceof Inet4Address) &&
                   it.hasMoreElements())
                inetaddr = it.nextElement();
            if (inetaddr instanceof Inet4Address)
                ifaddr = inetaddr.getAddress();
        }
        return isReachable0(addr.getAddress(), timeout, ifaddr, ttl);
    }
      private InetAddress      anyLocalAddress;
      private InetAddress      loopbackAddress;
  }
  