Learn more about the differences between compareTo and comparetoIgnorecase

compareTo: Compare
compareToIgnoreCase: Compare, ignore case
If the parameter string is equal to this string, return a value of 0; if this string is less than the string parameter in lexicographic order, return a value less than 0 the value of ; if this string is lexicographically greater than the string parameter, a value greater than 0 is returned.
Example: Dictionary order: 0123456ABCabc Uppercase letters come before lowercase letters

String query = new String();
String number = new String();
int i = 0;
query = "a";
number = "1";
i = query.compareTo("A"); (a在A之后，返回大于0的值)
i = number.compareTo("2"); (1在2之前，返回小于0的值)

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##compareToIgnoreCase() compares two strings without case sensitivity5.

Java classic string comparison method: compareToIgnoreCase()6.

Detailed explanation of the principle of return value of compareToIgnoreCase

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