Check MD5 file

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package test;

/**
 *
 * @author leo
 */
import java.io.FileInputStream;
import java.security.MessageDigest;

public class MD5CheckSumExample {

    @SuppressWarnings("empty-statement")
    public static void main(String[] args) throws Exception {
        MessageDigest md = MessageDigest.getInstance("MD5");
        FileInputStream fis = new FileInputStream("D:\\Coding\\HashCalc.exe");

        byte[] dataBytes = new byte[1024];

        int nread = 0;
        while ((nread = fis.read(dataBytes)) != -1) {
            md.update(dataBytes, 0, nread);
        };
        byte[] mdbytes = md.digest();

        //convert the byte to hex format method 1
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < mdbytes.length; i++) {
            sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
        }

        System.out.println("Digest(in hex format):: " + sb.toString());

        //convert the byte to hex format method 2
//        StringBuffer hexString = new StringBuffer();
//        for (int i = 0; i < mdbytes.length; i++) {
//            String hex = Integer.toHexString(0xff & mdbytes[i]);
//            if (hex.length() == 1) {
//                hexString.append('0');
//            }
//            hexString.append(hex);
//        }
//        System.out.println("Digest(in hex format):: " + hexString.toString());
    }
}