Return Value of compareTo () method of String

In the past, compareTo () was used to compare the total size of ASCII codes. CompareTo (), which is used to compare the size of the corresponding characters (ASCII order) first. If the first character is different from the first character of the parameter, end the comparison and return the difference between them, if the first character is the same as the first character of the parameter, compare the second character with the second character of the parameter, and so on, the length of the character to be compared is compared until all the characters to be compared or compared are compared. example: www.2cto. comString s1 = "abc"; String s2 = "abcd"; String s3 = "abcdfg"; String s4 = "1 bcdfg"; String s5 = "cdfg"; System. out. println (s1.compareTo (s2); //-1 (equal front, 1 smaller s1 length) System. out. println (s1.compareTo (s3); //-3 (equal front, small s1 length 3) System. out. println (s1.compareTo (s4); // 48 (the ASCII code of "a" is 97, and the ASCII code of "1" is 49, so 48 is returned) System. out. println (s1.compareTo (s5); //-2 (the ASCII code of "a" is 97, and the ASCII code of "c" is 99, So-2 is returned)