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Most of the comments are redundant and do not provide any help understanding what the code is doing.
For example:

private Point coord = new Point(); // An instance of Point
coord is...

Please edit your post and wrap your code with code tags:



**YOUR CODE GOES HERE**


to get highlighting and preserve formatting.

Have you added code to preload the path so that the...

It would be done in the main() method.
Build a path by calling the methods to add nodes, connect the nodes with edges and set the start and destination nodes. You may have to add a method here and...

A suggestion: Add code to load a path so a tester does not need to do that step and so that all testers will be working with the same path.

Please edit your post and wrap your code with code tags:



**YOUR CODE GOES HERE**


to get highlighting and preserve formatting.

Can you post details on what changes you are trying to...

Can you post your code (be sure to wrap in code tags)
and any specific java programming questions you have.

Your description of the project sounds like you need to do lots of design work that...