Java Data Type How to - Hash object to textual strings

Question

We would like to know how to hash object to textual strings.

Answer

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
//from   ww w.  j  av  a2s. c  om
public class Main {

  public static void main(String[] args) throws Exception {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    DataOutputStream dos = new DataOutputStream(baos);

    MessageDigest md = MessageDigest.getInstance("MD5");
    SomeObject testObject = new SomeObject();

    dos.writeInt(testObject.count);
    dos.writeLong(testObject.product);
    dos.writeDouble(testObject.stdDev);
    dos.writeUTF(testObject.name);
    dos.writeChar(testObject.delimiter);
    dos.flush();

    byte[] hashBytes = md.digest(baos.toByteArray());
    BigInteger testObjectHash = new BigInteger(hashBytes);

    System.out.println("Hash " + testObjectHash);

    dos.close();

  }
}

class SomeObject {
  int count = 200;
  long product = 1;
  double stdDev = 1.456d;
  String name = "Name";
  char delimiter = '\n';
}