If you’re storing passwords, don’t simply hash them, use bcrpyt.
Bcrypt was designed salt passwords in a way which makes it incredibly resource and time expensive to crack. See http://en.wikipedia.org/wiki/Bcrypt
jBcrypt is the Java implementation. Salt a password like so:
String password = BCrypt.hashpw("password", BCrypt.gensalt(12));
The number in the gen salt method specifies the number of rounds of hashing to apply.
The resulting salt is encoded in the password.
The check if a candidate string is the same as the hashed string, you can do the following