import java.io.*;public class CheckedIODemo {    public static void main(String[] args) throws IOException {       Adler32 inChecker = new Adler32();       Adler32 outChecker = new Adler32();       CheckedInputStream in = null;       CheckedOutputStream out = null;       try {           in = new CheckedInputStream(			   new FileInputStream("farrago.txt"),			   inChecker);           out = new CheckedOutputStream(			    new FileOutputStream("outagain.txt"),			    outChecker);       } catch (FileNotFoundException e) {           System.err.println("CheckedIODemo: " + e);           System.exit(-1);       } catch (IOException e) {           System.err.println("CheckedIODemo: " + e);           System.exit(-1);       }       int c;       while ((c = in.read()) != -1)          out.write(c);       System.out.println("Input stream check sum: " +			  inChecker.getValue());       System.out.println("Output stream check sum: " +			  outChecker.getValue());       in.close();       out.close();    }}