//project.java
import MULTISET;
public class Bag<E extends Keyed> implements Iterable<E> {
    //cannot find symbol. symbol: class Iterator. location: class project.Bag<E>
    public Iterator<E> iterator() {
        return new ArrIterator(this);
    }
    //same error as above
    public class ArrIterator implements Iterator<E> {
        Bag<E> arr;
        int coun;
        public ArrIterator(Bag<E> arr) {
            this.arr = arr;
            this.coun = 0;
        }
        public boolean hasNext() {
            return this.coun < arr.cardinality();
        }
        public E next() {
            if (!hasNext()) {
                throw new NoItemException();
            }
            return arr.getArray()[coun+1];
        }
        public void remove() {
            throw new UnsupportedOperationException();
        }
    }
}

//MULTISET.java
//cannot find symbol. symbol: class Iterator. location: interface MultiSet<E>
public interface MultiSet<E extends Keyed> extends Iterable<E> {
    public Iterator<E> iterator();
}

public class ArrIterator implements Iterator<E> {

public Iterator<E> iterator() {
    return new ArrIterator(this);
}