How the compareTo() Method works

public class CompareMethod {
    public static void main(String[] args){
        String a = "a";
        String b = "b";
        String A = "A";
        String B = "B";
        String ab = "ab";
        String aa = "aa";
        String cat = "cat";
        String can = "can";
        String dog = "dog";
        int compareab;
        int compareAB;
        int compareabaa;
        int comparecatcan;
        int comparecatdog;
        int compareAa;

        /* Give "a" a value of zero as a start of the alphabet and "z" a value of 25 to end the alphabet.
         *
         * Capital letters are applied in the same way. To determine a single letter's value comparable to that of another,
         * including same case, just subtract that value of the last letter compared to that of the first letter in the compareTo lines.
         *
         * The letters that are compared are the first letters that are found different in the string.
         *
         * When comparing letters of a different case, there is a 32 magnitude difference in either way, depending on what is being subtracted
         *
         * In conclusion, all letters and their cases are given a numerical value to be "compared" when using the compareTo method
         *
         * Sorry for the scrappy code, I was using it to move stuff around and compare the compareTo method to other things :)
         */

        System.out.println("Comparing String: " + a + " String: " + b);
        compareab = "a".compareTo("b");
        System.out.println(compareab); //Should output 1 "a - b"

        System.out.println("Comparing String: " + A + " String: " + B);
        compareAB = "A".compareTo("B");
        System.out.println(compareAB); //Should also output 1 "A - B"

        System.out.println("Comparing String: " + ab + " String: " + aa);
        compareabaa = "ab".compareTo("aa");
        System.out.println(compareabaa); //Should output -1 "ab - aa";

        System.out.println("Comparing String: " + cat + " String: " + can);
        comparecatcan = "cat".compareTo("can");
        System.out.println(comparecatcan); //Should output 6 "cat - can"

        System.out.println("Comparing String: " + cat + " String: " + dog);
        comparecatdog = "cat".compareTo("dog");
        System.out.println(comparecatdog); //Should output -1 "cat - dog"

        System.out.println("Comparing String: " + A + " String: " + a);
        compareAa = "A".compareTo("a"); //Should output -25 "A - a"
        System.out.println(compareAa);

    }
}