How does matches from BCryptPasswordEncoder.class java work?

Question

Java

Hello everyone, digging into BCryptPasswordEncoder some point is not clear to me, namely:
Example

@Test
    public void matchesTwoPassTest() {
        boolean resultOne = false;
        boolean resultTwo = false;
        boolean resultThree = false;
        String one = "alex";
        String two = "alex";
        String three = "alex";
        String oneEnc = "";
        String twoEnc = "";
        oneEnc = bCryptPasswordEncoder.encode(one);
        twoEnc = bCryptPasswordEncoder.encode(two);
        resultOne = bCryptPasswordEncoder.matches(two, oneEnc);
        resultTwo = bCryptPasswordEncoder.matches(one, twoEnc);
        resultThree = bCryptPasswordEncoder.matches(three, twoEnc);
        logger.debug(one +  " ONE ENCODE STRING " + oneEnc);
        logger.debug(two +  " TWO ENCODE STRING " + twoEnc);
        logger.debug("result : " + resultOne);
        logger.debug("result : " + resultTwo);
        assertTrue(resultOne);
        assertTrue(resultTwo);
        assertTrue(resultThree);
    }

Hashes of two identical variables one, two are different!
In the matches method, I put a hash from another variable, but it returns TRU!
Silly question but still not clear, does he have some kind of buffer there or what?
If it hashes with a random salt, then in the line of calling the matches method, even if you put the string from which the hash is, then there will be a different hash there, since it will hash the raw string again!
If anyone knows, please explain how it works! Thank you!

Answer 1

According to the documentation, the encoder accepts an 8-byte random salt. It has no effect on the matcher.
Apparently that's how it's meant to be.