### Question:
NetUtil { public static String toAddressString(InetAddress ip) { return toAddressString(ip, false); } private  NetUtil(); static boolean isIpV4StackPreferred(); static boolean isIpV6AddressesPreferred(); static byte[] createByteArrayFromIpAddressString(String ipAddressString); static String intToIpAddress(int i); static String bytesToIpAddress(byte[] bytes); static String bytesToIpAddress(byte[] bytes, int offset, int length); static boolean isValidIpV6Address(String ip); static boolean isValidIpV6Address(CharSequence ip); static boolean isValidIpV4Address(CharSequence ip); static boolean isValidIpV4Address(String ip); static Inet6Address getByName(CharSequence ip); static Inet6Address getByName(CharSequence ip, boolean ipv4Mapped); static String toSocketAddressString(InetSocketAddress addr); static String toSocketAddressString(String host, int port); static String toAddressString(InetAddress ip); static String toAddressString(InetAddress ip, boolean ipv4Mapped); static String getHostname(InetSocketAddress addr); static final Inet4Address LOCALHOST4; static final Inet6Address LOCALHOST6; static final InetAddress LOCALHOST; static final NetworkInterface LOOPBACK_IF; static final int SOMAXCONN; }### Answer:
@Test public void testIp6AddressToString() throws UnknownHostException { for (Entry<byte[], String> testEntry : ipv6ToAddressStrings.entrySet()) { assertEquals(testEntry.getValue(), toAddressString(InetAddress.getByAddress(testEntry.getKey()))); } }
@Test public void testIp4AddressToString() throws UnknownHostException { for (Entry<String, String> e : validIpV4Hosts.entrySet()) { assertEquals(e.getKey(), toAddressString(InetAddress.getByAddress(unhex(e.getValue())))); } }