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二叉树遍历(递归)
添加时间:2013-5-4 点击量:// 测试二叉树遍历,递归算法
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();
}
}
// 二叉树
class BinaryTree {
// 前序遍历
static <T> void priorderTraversal(Node<T> node) {
if (node != null) {
visitNode(node);
priorderTraversal(node.getLeftChild());
priorderTraversal(node.getRightChild());
}
}
// 中序遍历
static <T> void inorderTraversal(Node<T> node) {
if (node != null) {
inorderTraversal(node.getLeftChild());
visitNode(node);
inorderTraversal(node.getRightChild());
}
}
// 后序遍历
static <T> void postorderTraversal(Node<T> node) {
if (node != null) {
postorderTraversal(node.getLeftChild());
postorderTraversal(node.getRightChild());
visitNode(node);
}
}
// 二叉树深度
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;
}
// 接见节点
static <T> void visitNode(Node<T> node) {
System.out.print(node.getKey() + );
}
}
// 节点
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(); www.2cto.com
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;
}
}
输出成果:
所有随风而逝的都属于昨天的,所有历经风雨留下来的才是面向未来的。—— 玛格丽特·米切尔 《飘》
生成的二叉树:
A
|
|---------|
B C
| |
|---------| -----|
D E F
|
----|
G
二叉树深度:4
前序遍历:A B D G E C F
中序遍历:D G B E A C F
后序遍历:G D E B F C A