java实现设计一个二叉树类的结构

二叉树是每个节点最多有两个子树的数结构，被常用语实现二茬查找数和二叉堆,使用java可实现设计二叉树的结构 

package treeTest;

import java.util.ArrayList;
import java.util.List;

public class BTree {
    public BTree left;
    public BTree right;
    public BTree root;
    private Object data;
    //节点存入
    public List datas;

    public BTree(BTree left,BTree right,Object data){
        this.left = left;
        this.right = right;
        this.data = data;
    }

    public BTree(Object data){
        this(null,null,data);
    }

    public BTree(){}

    public void creat(Object[] obj){
        datas = new ArrayList();
        for (Object o : obj) {
            datas.add(new BTree(o));
        }

        root = datas.get(0);

        //建立二叉树
        for (int i = 0; i < obj.length/2; i++) {
            //左子树
            datas.get(i).left = datas.get(i*2+1);
            //右子树
            if(i*2+2