[snip]

Eh -- removing the <T> from "public class Iterator<T>" removed.
Apparently it considered this to be a separate T from the nesting
class's own <T>, and it was the two Ts it considered to differ in the
two iterator types.

This new code compiles with no errors or warnings; soon I will have
implemented a working Bag.

    private class Iterator implements java.util.Iterator<T> {
        private java.util.Iterator<Map.Entry<T, Integer>> i;
        private Map.Entry<T, Integer> entry;
        private int qty;

        Iterator () {
            i = inner.entrySet().iterator();
            qty = 0;
        }

        public T next () {
            if (qty == 0) {
                entry = i.next();
                qty = entry.getValue().intValue();
            }
            --qty;
            return entry.getKey();
        }

        public boolean hasNext () {
            return (qty > 0) || i.hasNext();
        }

        public void remove () {
            int n = entry.getValue().intValue() - 1;
            if (n > 0) {
                entry.setValue(new Integer(n));
            }
            assert qty == 0;
            i.remove();
        }
    }