import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
class Main {
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
/**
* Copy chars from a large (over 2GB) Reader to a
* Writer.
*
* This method buffers the input internally, so there is no need to use a
* BufferedReader.
*
* @param input
* the Reader to read from
* @param output
* the Writer to write to
* @return the number of characters copied
* @throws NullPointerException
* if the input or output is null
* @throws IOException
* if an I/O error occurs
* @since Commons IO 1.3
*/
public static long copyLarge(Reader input, Writer output)
throws IOException {
char[] buffer = new char[DEFAULT_BUFFER_SIZE];
long count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
}