Binary Search Tree Lookup Method

Hi guys, I'm having a bit of trouble creating the search method for the BST. I've come up with the following:

Code :

    public AnyClass search(String key) {
 
        BNode currentNode = root;
 
        while (true) {
        	int cmp = newNode.compareTo(currentNode);
 
            if (cmp < 0) {
            	BNode nextNode = currentNode.getLeft();
            	if (nextNode == null) {
            		currentNode.getLeft();
            		return null;
            	}
            	currentNode = nextNode;
            }
            else if (cmp > 0) {
            	BNode nextNode = currentNode.getRight();
            	if (nextNode == null) {
            		currentNode.getRight();
            		return null;
            	}
            	currentNode = nextNode;    		
            }
            else if (cmp == 0) {
            	return cmp;
            }	
        }
    }

BNode

Code :

package binarynodes;
 
import dataobjects.AnyClass;
 
public class BNode {
	public BNode left, right;
	public AnyClass obj;
 
	public BNode(AnyClass newObj){
		left = null;
		right = null;
		obj = newObj;
	}
 
	public void setLeft(BNode left){
		this.left = left;
	}
 
	public void setRight(BNode right){
		this.right = right; 
	}
 
	public BNode getLeft(){return left;}
	public BNode getRight(){return right;}
 
	public void setKey(AnyClass newObj){this.obj = newObj;}
	public AnyClass getKey(){return obj;}
 
	public void print(){
 
		System.out.println(obj.getData());	
	}
 
	public int compareTo(BNode other) {
	    return obj.compareTo(other.obj);
	}
 
}

I need to create a getKey method to BNode so that I can get the key of the currentNode so than I can compare string against string. How do I go about doing this?

Thanks