### Question:
NetUtils { public static String getIpByHost(String hostName) { try { return InetAddress.getByName(hostName).getHostAddress(); } catch (UnknownHostException e) { return hostName; } }  static int getRandomPort(); static int getAvailablePort(); static int getAvailablePort(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 InetAddress getLocalAddress(); static String getLogHost(); 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 final String LOCALHOST; static final String ANYHOST; }### Answer:
@Test public void getIpByHost() throws Exception { Assert.assertEquals("localhost", NetUtils.getHostName("localhost")); Assert.assertEquals("127.0.0.1", NetUtils.getIpByHost("localhost")); Assert.assertEquals("127.0.0.1", InetAddress.getByName("localhost").getHostAddress()); }