How does the compareTo() method, compare strings? [closed]

Answer 1

it compares two strings lexographically. check here in the String API.

If two strings are different, then either they have different characters at some index that is a valid index for both strings, or their lengths are different, or both. If they have different characters at one or more index positions, let k be the smallest such index; then the string whose character at position k has the smaller value, as determined by using the < operator, lexicographically precedes the other string.

Answer 2

All uppercase are preceding lowercase so:

"Be".compareTo("ay");

will return a negative value, which means "less-than".