Why does MessageDigest return different responses for the same line?

Question

I am trying to get the hash value for a string using MessageDigest in Java, but the value changes every time. When I run the program twice, it will again have different answers.

MessageDigest md = null; try { md = MessageDigest.getInstance("SHA-1"); } catch (NoSuchAlgorithmException nsae) { } md.update("string".getBytes()); byte[] digest = md.digest(); System.out.println(digest); md.reset(); md.update("string".getBytes()); byte[] digest2 = md.digest(); System.out.println(digest2); 

Answer 1

You output the byte[] object, not the contents of the byte array. Use

 System.out.println(Arrays.toString(digest1)); .... System.out.println(Arrays.toString(digest2));