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    public VertexIterator adjacentVertices(int v) throws IllegalArgumentException {        if (v < 0 || v >= numVertices) {            throw new IllegalArgumentException(                "Out of range: v = " + v);        }        return new AdjacentVerticesIterator(v);    }        private class AdjacentVerticesIterator(int v) implements VertexIterator {        private Iterator<Integer> setIterator;                AdjacentVerticesIterator(int v) {            setIterator = adjacentVertices[v];        }        public boolean hasNext() {         	return false;        }        public int next() throws NoSuchElementException {        	return 0;        }    }