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import java.util.*; public class BSTChecker { public static Node checkBSTValidity (Node rootNode) { // Your code here (remove the placeholder line below) return rootNode; }

import java.util.*; public class BSTChecker { public static Node checkBSTValidity (Node rootNode) { // Your code here (remove the placeholder line below) return rootNode; }

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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How would we validate BST in Java?

```java import java.util.*; public class BSTChecker { public static Node checkBSTValidity(Node rootNode) { // Your code here (remove the placeholder line below) return rootNode; } } ``` **Explanation of Code:** This Java code snippet defines a class named `BSTChecker` intended for checking the validity of a Binary Search Tree (BST). Let's break it down: 1. **Import Statement:** - `import java.util.*;`: This line imports all the utilities from the Java Utility package, which provides essential classes like lists, arrays, and data structures. 2. **Class Definition:** - `public class BSTChecker`: This declares a public class named `BSTChecker`. Being public means it can be accessed from any other class. 3. **Method Definition:** - `public static Node checkBSTValidity(Node rootNode)`: - This method is intended to check the validity of a BST starting from a given `rootNode`. - It is a static method, meaning it can be called without creating an instance of the `BSTChecker` class. - The method expects an argument of type `Node` named `rootNode` and returns a `Node` object. 4. **TODO Comment:** - `// Your code here (remove the placeholder line below)`: This comment indicates where the actual logic to check the BST validity should be implemented. 5. **Return Statement:** - `return rootNode;`: Currently, this method simply returns the rootNode object without performing any checks. This is a placeholder behavior and should be replaced with proper BST validation logic.
Transcribed Image Text:```java import java.util.*; public class BSTChecker { public static Node checkBSTValidity(Node rootNode) { // Your code here (remove the placeholder line below) return rootNode; } } ``` **Explanation of Code:** This Java code snippet defines a class named `BSTChecker` intended for checking the validity of a Binary Search Tree (BST). Let's break it down: 1. **Import Statement:** - `import java.util.*;`: This line imports all the utilities from the Java Utility package, which provides essential classes like lists, arrays, and data structures. 2. **Class Definition:** - `public class BSTChecker`: This declares a public class named `BSTChecker`. Being public means it can be accessed from any other class. 3. **Method Definition:** - `public static Node checkBSTValidity(Node rootNode)`: - This method is intended to check the validity of a BST starting from a given `rootNode`. - It is a static method, meaning it can be called without creating an instance of the `BSTChecker` class. - The method expects an argument of type `Node` named `rootNode` and returns a `Node` object. 4. **TODO Comment:** - `// Your code here (remove the placeholder line below)`: This comment indicates where the actual logic to check the BST validity should be implemented. 5. **Return Statement:** - `return rootNode;`: Currently, this method simply returns the rootNode object without performing any checks. This is a placeholder behavior and should be replaced with proper BST validation logic.
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