Node.java

public class Node implements Comparable
{
    public Node parentNode;
    public int xPosition;
    public int yPosition;
    public int movementCost;
    public int totalCost;

    public Node(int x, int y)
    {
        movementCost = 0;
        xPosition = x;
        yPosition = y;
    }

    public boolean equals(Object obj)
    {
        Node cNode = (Node) obj;
        return (cNode.xPosition == xPosition && cNode.yPosition == yPosition);
    }

    public int compareTo(Object o)
    {
        Node cNode = (Node) o;
        return new Integer(totalCost).compareTo(cNode.totalCost);
    }
}