java 求二叉樹深度

算法很簡單，就是比較左子節點深度 右節點深度

還有一個核心內容就是如果有值就+1，+1這個是整個算法的核心。

package javatest.suanfa.Erchashu;public class dept {		int height(TreeNode T)	{	  if (T==null) {		  return 0;	  }	  int l=height(T.getLeftChild());	  int r=height(T.getRightChild());	  System.out.PRintln("l==="+l+"---r=="+r+"------T==="+T.val);	  if (l>r) {	    return (l+1);	  }	  return (r+1);	}	public static void main(String[] args) {		// TODO Auto-generated method stub				TreeNode node = new TreeNode(1);		TreeNode node21 = new TreeNode(21);		TreeNode node22 = new TreeNode(22);		TreeNode node31 = new TreeNode(31);		TreeNode node32 = new TreeNode(32);		TreeNode node33 = new TreeNode(33);		TreeNode node43 = new TreeNode(43);		node.setLeftChild(node21);		node.setRightChild(node22);		node21.setLeftChild(node31);		node21.setRightChild(node32);		node22.setRightChild(node33);		node33.setRightChild(node43);		dept dp = new dept();		System.out.println(dp.height(node));			}}