Utility for graph related algorithm

This tutorial is just to provide all require utilities for graph related problems and algorithms.

State.java

public enum State {

	VISITED, UNVISITED, FOUND
}

Node.java

import java.util.ArrayList;
import java.util.List;

public class Node {

	private List<Node> adjacent = new ArrayList<>();
	private String vertex = "";
	private State state = State.UNVISITED;

	public Node(String vertex) {
		this.vertex = vertex;
	}

	public void addAdjacent(Node node) {
		adjacent.add(node);
	}

	public boolean isVisited() {
		return getState() == State.VISITED;
	}

	public boolean isFoundAlready() {
		return getState() == State.FOUND;
	}

	public State getState() {
		return state;
	}

	public void setState(State state) {
		this.state = state;
	}

	public List<Node> getAdjacent() {
		return adjacent;
	}

	public String getVertex() {
		return vertex;
	}

}

Graph.java

import java.util.ArrayList;
import java.util.List;

public class Graph {

	private List<Node> vertices = new ArrayList<>();

	public void addVertex(Node node) {
		vertices.add(node);
	}

	public List<Node> getVertices() {
		return vertices;
	}

}

Generating Graph :

public static Graph generateGraph() {

		Graph graph = new Graph();

		Node a = new Node("A");
		Node b = new Node("B");
		Node c = new Node("C");
		Node d = new Node("D");
		Node e = new Node("E");
		Node f = new Node("F");
		Node g = new Node("G");
		Node h = new Node("H");
		Node i = new Node("I");

		a.addAdjacent(b);
		a.addAdjacent(c);

		b.addAdjacent(d);
		b.addAdjacent(a);

		d.addAdjacent(b);
		d.addAdjacent(e);
		d.addAdjacent(f);

		e.addAdjacent(d);
		e.addAdjacent(f);
		e.addAdjacent(g);

		f.addAdjacent(e);
		f.addAdjacent(d);
		f.addAdjacent(g);

		g.addAdjacent(e);
		g.addAdjacent(f);

		c.addAdjacent(a);
		c.addAdjacent(h);

		h.addAdjacent(c);

		graph.addVertex(a);
		graph.addVertex(b);
		graph.addVertex(c);
		graph.addVertex(d);
		graph.addVertex(e);
		graph.addVertex(f);
		graph.addVertex(g);
		graph.addVertex(h);
		graph.addVertex(i);

		return graph;

	}