[Random Coding] De/Serialization Binary Tree

package RandomPractice;

import java.util.ArrayList;
import util.*;

public class DeSerializationBinaryTree {
	public static void serialize(BTNode root, ArrayList<Integer> list){
		if(root == null)
			list.add(-1);
		else{
			list.add(root.value);
			serialize(root.left, list);
			serialize(root.right, list);
		}
	}
	public static BTNode deserialize(ArrayList<Integer> list){
		if(list.size() == 0)
			return null;
		int i = list.get(0);
		list.remove(0);
		if(i != -1){
			BTNode root = new BTNode(i);
			root.left = deserialize(list);
			root.right = deserialize(list);
			return root;
		} else 
			return null;
	}
	public static void main(String[] args){
		BTNode root1 = new BTNode(1, null, null);
		root1.left = new BTNode(2, null, null);
		root1.right = new BTNode(5, null, null);
		root1.left.left = new BTNode(3, null, null);
		root1.left.right = new BTNode(4, null, null);
		
		ArrayList<Integer> list = new ArrayList<Integer>();
		serialize(root1, list);
		
		for(int i = 0; i < list.size(); i++)
			System.out.print(list.get(i) + " ");
		
		BTNode root = deserialize(list);
	}
}