A.java

package p;

import java.util.Collection;
import java.util.Iterator;

class C implements java.util.Collection {

	@Override
	public int size() {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public boolean isEmpty() {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public boolean contains(Object o) {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public Iterator iterator() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public Object[] toArray() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public Object[] toArray(Object[] a) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public boolean add(Object e) {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public boolean remove(Object o) {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public boolean containsAll(Collection c) {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public boolean addAll(Collection c) {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public boolean removeAll(Collection c) {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public boolean retainAll(Collection c) {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public void clear() {
		// TODO Auto-generated method stub
		
	}
    //...
}
class A {
    void m() {
        C c = new C ();
        for (Object obj : c)
            ;
    }
}