hello-algo/codes/java/chapter_tree/binary_tree.java

/**
 * File: binary_tree.java
 * Created Time: 2022-11-25
 * Author: krahets (krahets@163.com)
 */

package chapter_tree;

import utils.*;

public class binary_tree {
    public static void main(String[] args) {
        /* 初始化二叉树 */
        // 初始化节点
        TreeNode n1 = new TreeNode(1);
        TreeNode n2 = new TreeNode(2);
        TreeNode n3 = new TreeNode(3);
        TreeNode n4 = new TreeNode(4);
        TreeNode n5 = new TreeNode(5);
        // 构建节点之间的引用（指针）
        n1.left = n2;
        n1.right = n3;
        n2.left = n4;
        n2.right = n5;
        System.out.println("\n初始化二叉树\n");
        PrintUtil.printTree(n1);

        /* 插入与删除节点 */
        TreeNode P = new TreeNode(0);
        // 在 n1 -> n2 中间插入节点 P
        n1.left = P;
        P.left = n2;
        System.out.println("\n插入节点 P 后\n");
        PrintUtil.printTree(n1);
        // 删除节点 P
        n1.left = n2;
        System.out.println("\n删除节点 P 后\n");
        PrintUtil.printTree(n1);
    }
}