Java递归方法遍历二叉树的代码

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package com.wzs;

public class TestBinaryTree { public static void main(String[] args) { Node<String> g = new Node<String>("G", null, null); Node<String> e = new Node<String>("E", null, null); Node<String> f = new Node<String>("F", null, null); Node<String> d = new Node<String>("D", null, g); Node<String> b = new Node<String>("B", d, e); Node<String> c = new Node<String>("C", null, f); Node<String> a = new Node<String>("A", b, c);

System.out.println("生成的二叉树:"); System.out.println(" A"); System.out.println(" | "); System.out.println(" |---------|"); System.out.println(" B C"); System.out.println(" | |"); System.out.println(" |---------| -----|"); System.out.println(" D E F"); System.out.println(" |"); System.out.println(" ----|"); System.out.println(" G");

System.out.println("二叉树深度：" + BinaryTree.getDepth(a));

System.out.print("前序遍历："); BinaryTree.priorderTraversal(a); System.out.println();

System.out.print("中序遍历："); BinaryTree.inorderTraversal(a); System.out.println();

System.out.print("后序遍历："); BinaryTree.postorderTraversal(a); System.out.println(); }}

class BinaryTree { static <T> void priorderTraversal(Node<T> node) { if (node != null) { visitNode(node); priorderTraversal(node.getLeftChild()); priorderTraversal(node.getRightChild()); } }

static <T> void inorderTraversal(Node<T> node) { if (node != null) { inorderTraversal(node.getLeftChild()); visitNode(node); inorderTraversal(node.getRightChild()); } }

static <T> void postorderTraversal(Node<T> node) { if (node != null) { postorderTraversal(node.getLeftChild()); postorderTraversal(node.getRightChild()); visitNode(node); } }

static <T> int getDepth(Node<T> node) { if (node == null) { return 0; } int leftDepth = 0; int rightDepth = 0; leftDepth = getDepth(node.getLeftChild()); rightDepth = getDepth(node.getRightChild()); return (leftDepth > rightDepth ? leftDepth : rightDepth) + 1; }

static <T> void visitNode(Node<T> node) { System.out.print(node.getKey() + " "); }}

class Node<T> { private T key; private Node<T> leftChild; private Node<T> rightChild;

public Node() {

}

public Node(T key, Node<T> leftChild, Node<T> rightChild) { super(); this.key = key; this.leftChild = leftChild; this.rightChild = rightChild; }

public T getKey() { return key; }

public void setKey(T key) { this.key = key; }

public Node<T> getLeftChild() { return leftChild; }

public void setLeftChild(Node<T> leftChild) { this.leftChild = leftChild; }

public Node<T> getRightChild() { return rightChild; }

public void setRightChild(Node<T> rightChild) { this.rightChild = rightChild; }

}

输出结果生成的二叉树:A||---------|BC|||---------|-----|DEF|----|G二叉树深度：4前序遍历：ABDGECF中序遍历：DGBEACF后序遍历：GDEBFCA

转载于:https://www.cnblogs.com/51jiaoshou/p/10354793.html