Java Utililty Methods Mac Address to String

byte[] macBytes = new byte[6];
try {
    String[] strArr = mac.split(":");
    for (int i = 0; i < strArr.length; i++) {
        int value = Integer.parseInt(strArr[i], 16);
        macBytes[i] = (byte) value;
} catch (Exception e) {
...

StringBuilder strBuilder = new StringBuilder();
for (int i = 0; i < mac.length; i++) {
    strBuilder.append(String.format("%02X", mac[i]));
    if (i < mac.length - 1) {
        strBuilder.append(":");
return strBuilder.toString();
...

StringBuilder b = new StringBuilder();
for (int i = 0; i < mac.length; i++) {
    b.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? ":" : ""));
return b.toString();

StringBuilder sb = new StringBuilder();
for (int i = 0; i < 6; i++) {
    String octet = (Integer.toHexString(mac[i] & 0xFF)).toUpperCase();
    if (octet.length() == 1) {
        sb.append("0");
    sb.append(octet);
    if (i != 5) {
...

final StringBuffer sb = new StringBuffer(address.length * 3);
for (int i = 0; i < address.length; i++) {
    if (0 != i) {
        sb.append(':');
    appendHexValue(sb, address[i]);
return sb.toString();
...

String value = String.format("%012x", macAddress);
char[] chars = value.toCharArray();
final StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append(chars[0]).append(chars[1]);
for (int pos = 2; pos < value.length(); pos += 2) {
    stringBuilder.append(":").append(chars[pos]).append(chars[pos + 1]);
return stringBuilder.toString();
...

if (srcstr == null) {
    return "null";
StringBuffer buf = new StringBuffer();
for (int i = 0; i < srcstr.length(); i = i + 3) {
    buf.append(srcstr.charAt(i));
    buf.append(srcstr.charAt(i + 1));
return buf.toString();