Copy Stream with buffer in Java

//from www .j a  va 2s.  c o  m
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class Main {

  public static void main(String[] args) {

    try {
      copy(System.in, System.out);
    } catch (IOException ex) {
      System.err.println(ex);
    }
  }

  public static void copy(InputStream in, OutputStream out) throws IOException {

    BufferedInputStream bin = new BufferedInputStream(in);
    BufferedOutputStream bout = new BufferedOutputStream(out);

    while (true) {
      int datum = bin.read();
      if (datum == -1)
        break;
      bout.write(datum);
    }
    bout.flush();
  }
}