Java Utililty Methods UTF8 Convert To

if (string == null) {
    return null;
return string.getBytes("UTF-8");

if (b[s] >> 7 == 0) {
    return b[s];
} else if ((b[s] & 0xe0) == 0xc0) { 
    return (b[s] & 0x1f) << 6 | 
            (b[s + 1] & 0x3f);
} else if ((b[s] & 0xf0) == 0xe0) {
    return (b[s] & 0xf) << 12 | (b[s + 1] & 0x3f) << 6 | (b[s + 2] & 0x3f);
} else if ((b[s] & 0xf8) == 0xf0) {
...

int cpt;
cpt = (((b1 & ~B11111) << 18) | ((b2 & ~B11) << 12) | ((b3 & ~B11) << 6) | (b4 & ~B11));
return cpt;

StringBuffer sb = new StringBuffer();
for (int i = 0; i < str.length(); i++) {
    char c = str.charAt(i);
    switch (c) {
    case '+':
        sb.append(' ');
        break;
    case '%':
...

char[] strBuf = new char[utf8Len];
int i = stPos;
int j = 0;
int limit = stPos + utf8Len;
while (i < limit) {
    int b = src[i++] & 255;
    if (b >= 224) {
        b = (b & 15) << 12;
...

char[] myBuffer = inStr.toCharArray();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < inStr.length(); i++) {
    Character.UnicodeBlock ub = Character.UnicodeBlock.of(myBuffer[i]);
    if (ub == Character.UnicodeBlock.BASIC_LATIN) {
        sb.append(myBuffer[i]);
    } else if (ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
        int j = (int) myBuffer[i] - 65248;
...

int i = srcIndex;
int j = dstIndex;
int limit = srcIndex + len;
while (i < limit) {
    int b = src[i++] & 0xFF;
    if (b >= 0xE0) {
        b = (b & 0x0F) << 12;
        b = b | (src[i++] & 0x3F) << 6;
...