Java - Generating a random salt isn't random

I'm trying to generate a salt in Java to use with a hashing algorithm for secure password storage. I'm using the following code to create the random salt:

private static String getSalt() throws NoSuchAlgorithmException {
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
    byte[] salt = new byte[16];
    sr.nextBytes(salt);
    System.out.println(salt.toString());
    return salt.toString();
}

Which should generate a completely secure, randomly generated salt to use in my hashing algorithm. When I run the code however, it keeps outputting the same salt every time... Indicating that the salt being generated isn't random at all.

For obvious security purposes, each user needs a unique salt however if I use this code each time a new account is created then every user will have the same salt, defeating the purpose of having it in the first place.

My question is this: Why does this keep giving me the same salt and what can I do to ensure the salt generated is completely random each time the code is run?