checkeddidemo.java

初期JAVA学习非常有用的资料。帮助深入了解API。特别是Applet。

import java.io.*;

public class CheckedDIDemo {
    public static void main(String[] args) throws IOException {

        Adler32 inChecker = new Adler32();
        Adler32 outChecker = new Adler32();
        CheckedDataInput in = null;
        CheckedDataOutput out = null;

        try {
            in = new CheckedDataInput(
			    new DataInputStream(
                            new FileInputStream("farrago.txt")),
			    inChecker);
            out = new CheckedDataOutput(
			     new DataOutputStream(
                             new FileOutputStream("outagain.txt")),
			     outChecker);
        } catch (FileNotFoundException e) {
            System.err.println("CheckedIOTest: " + e);
            System.exit(-1);
        } catch (IOException e) {
            System.err.println("CheckedIOTest: " + e);
            System.exit(-1);
        }

        boolean EOF = false;

        while (!EOF) {
            try {
                int c = in.readByte();
                out.write(c);
            } catch (EOFException e) {
                EOF = true;
            }
        }

        System.out.println("Input stream check sum: " +
			   in.getChecksum().getValue());
        System.out.println("Output stream check sum: " +
			   out.getChecksum().getValue());
    }
}