private void breadthFirstSearch(UndirectedGraph g, int a, boolean[] visited){
    	Queue<Integer> q = new LinkedList<Integer>();
    	visited[a] = true;
    	q.add(a);
    	System.out.print(a + " ");
    	while(!q.isEmpty()){
    		int x = q.remove();
    		VertexIterator vi = g.adjacentVertices(x);
    		while(vi.hasNext()){
    			if(!visited[vi.next()]){
    				System.out.print(vi.next() + " ");
    				q.add(vi.next());
    				visited[vi.next()] = true;
    			}
    		}
    	}
    }