String convertCase(String str) {
        if (str == null) {
            return null;
        }
        return isSensitive ? str : str.toLowerCase();
    }
String convertCase(String str) {
        if (str == null) {
            return null;
        }
        return isSensitive ? str : str.toLowerCase();
    }
String convertCase ( String str ) { if ( str == null ) { return null ; } return isSensitive ? str : str . toLowerCase ( ) ; }
Converts the case of the input String to a standard format.
Subsequent operations can then use standard String methods.

@param str  the string to convert, null returns null
@return the lower-case version if case-insensitive
Converts the case of the input String to a standard format . Subsequent operations can then use standard String methods .