Java Utililty Methods InputStream Copy nio

copy(in, new FileOutputStream(f), startAt, true, true);

byte[] b = new byte[IO_BUFFER_SIZE];
int read;
while ((read = in.read(b)) != -1) {
    out.write(b, 0, read);

long filesize = 0;
try {
    byte[] buffer = new byte[BUFF_SIZE];
    int bytesRead = in.read(buffer);
    while (bytesRead != -1) {
        filesize += bytesRead;
        out.write(buffer, 0, bytesRead);
        bytesRead = in.read(buffer);
...

copy(in, out, 512 * 1024);

try {
    int byteCount = 0;
    byte[] buffer = new byte[BUFFER_SIZE];
    int bytesRead = -1;
    while ((bytesRead = in.read(buffer)) != -1) {
        out.write(buffer, 0, bytesRead);
        byteCount += bytesRead;
    out.flush();
    return byteCount;
} finally {
    try {
        in.close();
    } catch (IOException ex) {
    try {
        out.close();
    } catch (IOException ex) {

byte[] buf = new byte[1024 * 64];
long total = 0;
int size = 0;
while ((size = in.read(buf)) != -1) {
    out.write(buf, 0, size);
    total += size;
return total;
...

byte[] buffer = new byte[BUFFER_SIZE];
int len;
try {
    while ((len = in.read(buffer)) != -1) {
        out.write(buffer, 0, len);
} finally {
    Throwable t = null;
...

byte[] buffer = new byte[2 * 1024];
long total = 0;
int count;
while ((count = input.read(buffer)) != -1) {
    output.write(buffer, 0, count);
    total += count;
return total;
...

byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
long count = 0L;
int n = 0;
while (-1 != (n = input.read(buffer))) {
    output.write(buffer, 0, n);
    count += n;
return count;
...

if ((output instanceof FileOutputStream) && (input instanceof FileInputStream)) {
    try {
        FileChannel target = ((FileOutputStream) output).getChannel();
        FileChannel source = ((FileInputStream) input).getChannel();
        source.transferTo(0, Integer.MAX_VALUE, target);
        source.close();
        target.close();
        return;
...