Generates a string containing all of the edges in the tree rooted at "this" node, in DOT format.

GenerateDOT.java

/**
 * Generates a string containing all of the edges in the tree rooted at "this" node, in DOT format.
 * Assumes this node has member variables called “data”, “leftChild”, and “rightChild”.
 *
 * @return DOT format string to enter at http://www.webgraphviz.com
 */
public String generateDot() throws Exception
{
    // `root` represents the root node of the binary search tree
    if (root == null)
        throw new Exception("BST not large enough to visualize.");

    String result = "digraph BST {\n";
    result += "  node [shape=record]\n";

    result += root.generateDot();

    return result + "}";
}