//file: rot13CryptInputStream.javapackage learningjava.protocolhandlers.crypt;import java.io.*;abstract class CryptInputStream extends InputStream {    InputStream in;    OutputStream out;    abstract public void set( InputStream in, OutputStream out );} // end of class CryptInputStreamclass rot13CryptInputStream extends CryptInputStream {    public void set( InputStream in, OutputStream out ) {        this.in = new learningjava.io.rot13InputStream( in );    }    public int read(  ) throws IOException {        return in.read(  );    }}