minor structural improvements

    // METHODS

    // ... getters

    public final Integer getNodeId() { return nodeId; }

    public final int getNodeId() { return nodeId; }

    public final keyType getKey() { return key; }

    public BST<keyType> getLeft() { return left; }

    public BST<keyType> getRight() { return right; }

    // ... setters

    public final void setNodeID(Integer newId) { nodeId=newId; }

    public void setNodeID(int newId) { nodeId=newId; }

    public void setLeft(BST<keyType> newLeft) { left=newLeft; }

    public void setRight(BST<keyType> newRight) { left=newRight; }

     *

     * @param prefix The current prefix for the subtree being printed

     */

    final String toString(String prefix) {

    String toString(String prefix) {

        String result = "";

        // output the key

    protected keyType key; // the key stored by this node

    protected BST<keyType> left;    // the left child of this node

    protected BST<keyType> right;   // the right child of this node

    private Integer nodeId;         // the current node ID

    protected Integer nodeId;         // the current node ID

    private static Integer nodeIdCounter=0; // a counter for node IDs

}