二叉树的深度 Java

下面是是实现二叉树的递归算法的实现，其思想就是，若为空，则其深度为0，否则，其深度等于左子树和右子树的深度的最大值加1：
class Node{
String name;
Node left;
Node right;
public Node(String name) {
this.name = name;
}
@Override
public String toString() {
return name;
}
}
//定义二叉树
class BinaryTree{
Node root;

public BinaryTree(){
root = null;
}
//为了方便起见，我就直接写个初始化的二叉树，详细的可以见以前的日志
public void initTree(){

Node node1 = new Node("a");
Node node2 = new Node("b");
Node node3 = new Node("c");
Node node4 = new Node("d");
Node node5 = new Node("e");
root = node1;
node1.left = node2;
node2.right = node3;
node1.right = node4;
node3.left = node5;
}
//求二叉树的深度
int length(Node root){
int depth1;
int depth2;
if(root == null) return 0;
//左子树的深度
depth1 = length(root.right);
//右子树的深度
depth2 = length(root.left);
if(depth1>depth2)
return depth1+1;
else
return depth2+1;
}
}
public class TestMatch{
public static void main(String[] args) {
BinaryTree tree = new BinaryTree();
tree.initTree();
System.out.println(tree.length(tree.root));
}
}