Compressing Streams: File Summer : Checksum « File « Java Tutorial

1. Java Tutorial
2. File
3. Checksum

import java.io.FileInputStream;
import java.io.IOException;
import java.util.zip.CRC32;
import java.util.zip.Checksum;

public class Main {

  public static void main(String[] args) throws IOException {
    FileInputStream fin = new FileInputStream("a.zip");
    Checksum cs = new CRC32();
    for (int b = fin.read(); b != -1; b = fin.read()) {
      cs.update(b);
    }
    System.out.println(cs.getValue());
    fin.close();
  }
}