Stuff

public String toString() {    	StringBuilder sb = new StringBuilder();        sb.append("Vertices: " + numVertices + " " + "Edges: {");                for (int i = 0; i < numVertices; i++) {        	for (int j : adjacentVertices[i]) {                if (j >= i) {                                	if (!edgeCosts.containsKey(new Edge(i, j))) {                		sb.append("(" + i + "," + j + "), ");                	} else {                		sb.append("(" + i + "," + j + "," + edgeCosts.get(new Edge(i, j)) + "), ");                	}                }            }        }                if (numEdges > 0) {            sb.setLength(sb.length() - 2); // Remove trailing ", "        }                sb.append("}");                return sb.toString();    }