FileInputStream.read() and non-blocking file i/o

Question

According to the API, FileInputStream.read() is :
public native int read() throws IOException
Reads a byte of data from this input stream. This method blocks if no input is yet available.
Returns:
the next byte of data, or -1 if the end of the file is reached.In what instances does the read() blocks? Is there a danger that the call to read() would block forever?

Answer 1

thanks martian!
is the ff code right enough to prevent i/o blocking?
  FileInputStream fis = new FileInputStream(src);
  FileOutputStream fos = new FileOutputStream(sPersistorFolder+src.getName());
  if(fis.available() > 0) {
    int c = -1;
    while((c=fis.read()) != -1) {
      fos.write(c);
  fis.close();
  fos.close();