Case conversion issues

Title:
Password letter: ABCDEFGHIJKLMNOPQRSTU VWXYZ
original letter: VWXYZABCDEFGHIJKLMNOP QRSTU

analysis:

By the title of "Password letters" and "the original letter" analysis available, it can be divided into the following letter to "E" and "F" for the cut-off point

The situation is as follows:

Password letter: ABCDE FGH IJKLMNOPQRSTUVWXYZ

Original letters: VWXYZ A BCDEFGHIJKLMNOPQRST U

Analysis can be obtained, prior to the E "Password letters" available 5 Save "original letters used herein," a "password letter" plus 21 available "herein original letter" E after

Thus code is as follows:

public class Main{
 public static void main(String[] args) {
        Scanner sc = new Scanner ( System.in );
        while (sc.hasNext ( )) {
            String value = sc.nextLine ( );
             //将字符串转换为字符数组，以便调用字符
            char[] chars = value.toCharArray ( );
            for (int i = 0; i < chars.length; i++) {
                char c = chars[i];
                if ('A' <= c ) {
                  //核心代码，进行大小写的转换
                    c = (char) ( 'E' < c ? ( c - 5 ) : ( c + 21 ) );
                    chars[i] = c;
                }
            }
            System.out.println ( new String ( chars ) );
        }
    }
}