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Thread: Java Newbie: How to Code Node and its Neighbors?

  1. #1
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    Default Java Newbie: How to Code Node and its Neighbors?

    Hi guys

    I'm new to programming and as a School task i need to implement BFS,DFS and A* in java.

    in short i'm given a grid of say 4x4, with a given start and goal position and i need to go through each node/tile in the grid using the above algorithms til the goal is found.

    to begin with i don't know how to code the neighbors of a given node. For example tile 1 in grid as 2 and 9 as neighbors but i'm struggling to code that. I need the neighbours part so that i can move from start position to other parts of gird legally by moving horizontally or vertically.

    my node class is:

    class node {
        int value;
       LinkedList<node> neighbors;
       bool expanded;
    }

    Simply i can't visualize how the above node class will work and i've been looking at it for hours.

    let's say i'm given a 8x8 grid right, So if i start the program with a grid of size 8x8 right :

    1 - my main will func will create an array of nodes using
     node[8][8] = new node.....
    2 - i then have to initialize each tile in the grid to represents its value of 1,2,3,4...64 by looping through all of the tiles(in case of 8x8 gird).
    3 - somehow i need to add the neighbors of each tile, for example tile 1 in grid has tiles 2,9 as neighbours, I can't just do it by manually and hard code it for each node because what if there is 16x16 grid or much larger grid , it'll take forever. I just don't know how to go about so if anyone can give me some details i would really appreciate it.

    Thank you
    Last edited by ke3pup; April 20th, 2010 at 01:03 AM.


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