“Auto increment” alphabet in Java?

Question

\"Auto increment\" alphabet in Java - is this possible? From A to Z without a third-party library?

Answer 1

This is my solutions, just a little more complicated than other examples above, but extendible for other iterations (used pattern iterator):

class Alphabet implements Iterable{

    private char start;
    private char end;

    public Alphabet(char start, char end) {
        this.start=start;
        this.end=end;
    }

    @Override
    public Iterator iterator() {
        return new AlphabetIterator(start, end);
    }

    class AlphabetIterator implements Iterator{

        private String current;
        private String end;

        private AlphabetIterator(char start, char end) {
            this.current=String.valueOf(--start);
            this.end=String.valueOf(end);
        }   

        @Override
        public boolean hasNext() {
            return (current.charAt(0) < end.charAt(0));
        }

        @Override
        public String next() {
            char nextChar = current.charAt(0);
            return this.current=String.valueOf(++nextChar);
        }
    }

    public static void main (String[] arg){

        for (String str:new Alphabet('B', 'Y')){
            System.out.print(str+" ");
        }
    }
}

Output: B C D E F G H I J K L M N O P Q R S T U V W X Y