2. 코드

public class Ascii {
    public static void main(String[] args) {
        String str = "abcdefghijklmnopqrstuvwxyz";

        for ( int i=0; i<str.length(); i++ ) {
            char c = str.charAt(i);
            System.out.println(c + " = " + (int)c);
        }

        String strUpper = str.toUpperCase();

        for ( int i=0; i<strUpper.length(); i++ ) {
            char c = strUpper.charAt(i);
            System.out.println(c + " = " + (int)c);
        }
    }
}