Java Utililty Methods IP Address Get

Enumeration<NetworkInterface> interfaces;
try {
    interfaces = NetworkInterface.getNetworkInterfaces();
} catch (SocketException e) {
    return null;
List<InetAddress> ips = new ArrayList<InetAddress>();
while (interfaces.hasMoreElements()) {
...

ArrayList<String> ips = new ArrayList<String>();
Enumeration<NetworkInterface> netcards = NetworkInterface.getNetworkInterfaces();
while (netcards.hasMoreElements()) {
    Enumeration<InetAddress> inets = netcards.nextElement().getInetAddresses();
    while (inets.hasMoreElements()) {
        InetAddress inet = inets.nextElement();
        String addr = inet.getHostAddress();
        ips.add(addr);
...

if (isCacheEnabled && isCacheValid && !refresh) {
    return new ArrayList<String>(cachedLocalIPs);
List<String> result = new ArrayList();
try {
    Enumeration<NetworkInterface> eNics = NetworkInterface.getNetworkInterfaces();
    while (eNics.hasMoreElements()) {
        NetworkInterface nic = eNics.nextElement();
...

try {
    List<String> ips = new ArrayList<String>();
    for (Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces(); interfaces
            .hasMoreElements();) {
        NetworkInterface networkInterface = interfaces.nextElement();
        if (networkInterface.isLoopback() || networkInterface.isVirtual() || !networkInterface.isUp()) {
            continue;
        Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();
        if (addresses.hasMoreElements()) {
            InetAddress nextElement = addresses.nextElement();
            if (nextElement instanceof Inet4Address) {
                ips.add(nextElement.getHostAddress());
    return ips;
} catch (SocketException e) {
    throw new RuntimeException(e.getMessage(), e);

InetAddress inetAddress = null;
Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
outer: while (networkInterfaces.hasMoreElements()) {
    Enumeration<InetAddress> inetAds = networkInterfaces.nextElement().getInetAddresses();
    while (inetAds.hasMoreElements()) {
        inetAddress = inetAds.nextElement();
        if (inetAddress instanceof Inet6Address && !isReservedAddr(inetAddress)) {
            break outer;
...

if (localIp != null) {
    return localIp;
try {
    Enumeration<NetworkInterface> netInterfaces = NetworkInterface.getNetworkInterfaces();
    InetAddress ip = null;
    while (netInterfaces.hasMoreElements()) {
        NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
...

try {
    InetAddress localHost = InetAddress.getLocalHost();
    String localIp = localHost.getHostAddress();
    if (validationIpV4FormatAddress(localIp)) {
        return localIp;
} catch (UnknownHostException ignore) {
return LOOPBACK_ADDRESS_V4;

List<String> result = new ArrayList<String>();
Enumeration<NetworkInterface> interfaces = null;
try {
    interfaces = NetworkInterface.getNetworkInterfaces();
} catch (SocketException ignore) {
if (interfaces == null) {
    return Collections.EMPTY_LIST;
...

long ip;
long workLong1, workLong2, workLong3, workLong4;
workLong1 = (long) buff[0] & 0x000000FF;
workLong1 = workLong1 << 24;
workLong2 = (long) buff[1] & 0x000000FF;
workLong2 = workLong2 << 16;
workLong3 = (long) buff[2] & 0x000000FF;
workLong3 = workLong3 << 8;
...

if (ipString == null) {
    throw new IllegalArgumentException("null input");
InetAddress ip;
try {
    ip = InetAddress.getByName(ipString);
} catch (Exception e) {
    throw new IllegalArgumentException("Ip is not valid" + ipString);
...