NumericBinaryTree

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/**
 *
 * @author Joshua
 */
public class NumericBinaryTree {

    private NumericBinaryTree root;
    private NumericBinaryTree leftChild;
    private NumericBinaryTree rightChild;
    private Number rootValue;

    /**
    * Constructor that will create an empty numeric
    * binary tree.
    * @param
    */
    public NumericBinaryTree() {
        this.root = null;
        this.leftChild = null;
        this.rightChild = null;
    }

    /**
    * Constructor that will create a numeric binary tree with
    * a value.
    * @param takes a value of type number and sets it as the
    * root of the tree
    */
    public NumericBinaryTree(Number rootValue) {
        if (rootValue == null) {
            throw new IllegalArgumentException("");
        }
        this.rootValue = rootValue;
        this.root = root;
        System.out.println("this is the root value" + rootValue);
        System.out.println("this is the root of the tree " + root);
    }

    /**
    * Constructor that will create a binary tree with a value and
    * its left and right child.
    *
    * @param takes a value of type number and sets it as the
    * root of the tree. Takes a tree for its left child and right
    * child.
    */

    public NumericBinaryTree(Number rootValue, NumericBinaryTree leftChild,
            NumericBinaryTree rightChild) {
        if (rootValue == null) {
            throw new IllegalArgumentException("");
        }
        this.rootValue = rootValue;
        this.root = root;
        this.leftChild = leftChild;
        this.rightChild = rightChild;

        System.out.println("in a tree with children whose root value is" + rootValue);
    }

    /**
    * Check to see if the tree is empty.
    *
    * @param
    */
    public boolean isEmpty() {
        return root == null;
    }
}
public class NumericBinaryTreeTest {


    public static void main(String[] args) {
        Number a = 0;
        Number b = 1;
        Number c = 2;
        Number d = 3;

        NumericBinaryTree emptyTree = new NumericBinaryTree();

        NumericBinaryTree treeWithAValue = new NumericBinaryTree(a);

        NumericBinaryTree treeWithChildren = new NumericBinaryTree(b, emptyTree,
        treeWithAValue);

        System.out.println(treeWithAValue.isEmpty());
        System.out.println(emptyTree.isEmpty());
        System.out.println(treeWithChildren.isEmpty());
    }

}