以下陈述的解释是什么？ [英] What is the explaination of the below statements

问题描述

class Node
{
    int data;
    Node root,left, right;
 
    public Node(int item)
    {
        data = item;
        left = right = null;
    }
    root.left=null;
}

我是java的初学者，我无法理解这段代码。 Node是一个类，Node（）是用于赋值的构造函数。什么是Node root，左边是什么意思？什么是root.left意味着什么？我应该学习哪个概念来理解这个？如果我们创建root作为对象意味着我必须使用new关键字，但这里的代码没有Node root = new Node（）;.



我尝试了什么：



我试过引用一些资源，但我无法理解这一点。任何人都可以帮忙。

I am beginner to java and I am unable to understand this code. Node is a class and Node() is constructor for assigning value. What is Node root,left mean? And what is root.left means? Which concept i should learn to understand this? If we are creating root as object means I have to use "new" keyword but here the code do not have Node root=new Node();.

What I have tried:

I tried referring some resources but I am unable to understand this. Can anyone please help.

推荐答案

OK - Node是一个类，正如你所说，Node（）是该类的构造函数，它接受一个整数参数。

此代码不会创建节点的实例 - 这是 执行时执行的代码 使用 new 关键字创建一个实例。

它的含义是Node类的 data 元素，它保存节点的值，以及三个对其他节点的引用： root ，左，右 - 以及最初创建节点时，左和右不要去任何地方所以他们总是设置为 null 表示。

当您使用多个 Node 实例时，构建一个二进制文件树，您将填写根，左和正确适当地形成实际的树st结构本身。

返回并重新阅读你的笔记：这一切都已经解释过了！

OK - Node is a class, and as you say, Node() is a constructor of that class, which takes an integer parameter.
This code doesn't create an instance of a Node - it's the code that is executed when you do create an instance by using the new keyword.
What it's saying is that the Node class has a data element, which holds the value for the node, and three references to other Nodes: root, left, and right - and when you initially create the Node, left and right don't "go anywhere" so they are always set to null to indicate that.
When you use a number of Node instances build a binary tree, you will "fill in" the root, left, and right appropriately to form the actual tree structure itself.
Go back and re-read your notes: this should all have been explained!

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