Java da TreeNode

//************TreeNode Sınıfı**************//
package treenode;
/**
 *
 * @author şerzan
 */
public class Tree {
    private TreNode root;
    public Tree(){root=null;}
    public TreNode getRoot(){return root;}
   
}
//************TreNode sınıfı***************//
package treenode;
/**
 *
 * @author şerzan
 */
public class TreNode {
   
    public int data;
    public TreeNode leftChild;
    public TreeNode rightChild;
    public void displayNode(){
        System.out.println(""+data+""); }
//*************Main sınıfı***************//
package treenode;

/**
 *
 * @author şerzan
 */
public class TreeNode {

    public static void main(String[] args) {
      
    }
    private Object root;
    public void preOrder(TreNode localRoot){
    if(localRoot!=null){
    localRoot.displayNode();
    preOrder(localRoot.leftChild);
    preOrder(localRoot.rightChild);
   
    }
    }
public void inOrder(TreNode localRoot){
if(localRoot!=null){
inOrder(localRoot.leftChild);
localRoot.displayNode();
inOrder(localRoot.rightChild);
}
}
public void postOrder(TreNode localRoot){
if(localRoot!=null){
    postOrder(localRoot.leftChild);
    postOrder(localRoot.rightChild);
    localRoot.displayNode();
}
}
public void insert(int newdata){
TreNode newNode=new TreNode();
newNode.data=newdata;
if(root==null)
    root=newNode;
else
{
TreNode current=(TreNode) root;
TreNode parent;
while(true){
parent=current;
if(newdata<current.data){
}
}
}
}