Java Utililty Methods OutputStream Write String

try {
    writeData(baos, s.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
    throw new RuntimeException("Cannot write string", e);

final int length = s.length();
int strIdx = 0;
while (strIdx < length) {
    writeChar(output, s.charAt(strIdx++));

stream.writeShort((short) string.length());
for (int i = 0; i < string.length(); i++) {
    stream.writeChar(string.charAt(i));

OutputStreamWriter writer = new OutputStreamWriter(os, charsetName);
BufferedWriter bw = new BufferedWriter(writer);
bw.write(request);
bw.write("\r\n");
bw.flush();

byte[] b = s.getBytes("UTF-8");
writeLong(os, b.length);
os.write(b, 0, b.length);

int n = s.length();
for (int i = 0; i < n; i++) {
    char c = s.charAt(i);
    if (c < 0x80) {
        os.write(c);
    } else if (c < 0x800) {
        os.write(0xc0 + (c >> 6));
        os.write(0x80 + (c & 0x3f));
...

byte[] b = s.getBytes("UTF-8");
writeLong(os, b.length);
os.write(b, 0, b.length);

for (char c : str.toCharArray()) {
    os.write(c);
os.write('\0');

BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(text);
writer.flush();
writer.close();

byte[] buf = s.getBytes("UTF8");
short len = (short) buf.length;
out.write((len >> 8) & 0xFF);
out.write(len & 0xFF);
out.write(buf);