A* Pathfinding Libgdx?

Newbie & Debugging Questions
#1

Okay I posted not long ago about path finding which i have finally had a look at, I understand how it works but cannot implement it into code
Can someone advice me on what i need to do next please

	private ArrayList<Node> openList;
	private ArrayList<Node> closedList;
	
	public APathfind() {
		openList = new ArrayList<Node>();
		closedList = new ArrayList<Node>();
	}
	
	public void calculatePath(Vector2 start,Vector2 target,MasterTile[][] map){
		openList.clear();
		closedList.clear();
		
		
		Node startNode = new Node();
		openList.add(startNode);
		
		
	}

Node

public float h; // Distance from a node to the target node (Manhatten)
	public float g; // Movement cost from node to another node
	public float f; // h+g
	
	public Node parent;
	
	public Node(float h,float g,float f) {
		this.h = h;
		this.g = g;
		this.f = f;
	}
	public Node() {
		this(0,0,0);
	}