Symmetric Tree or Mirror Tree

                            
import java.util.*;

// Node structure for the binary tree
class Node {
    int data;
    Node left;
    Node right;

    // Constructor to initialize
    // the node with a value
    public Node(int val) {
        data = val;
        left = null;
        right = null;
    }
}

class Solution {
    // Function to check if
    // two subtrees are symmetric
    private boolean isSymmetricUtil(Node root1, Node root2) {
        // Check if either subtree is null
        if (root1 == null || root2 == null) {
            // If one subtree is null, the other
            // must also be null for symmetry
            return root1 == root2;
        }
        // Check if the data in the current nodes is equal
        // and recursively check for symmetry in subtrees
        return (root1.data == root2.data)
                && isSymmetricUtil(root1.left, root2.right)
                && isSymmetricUtil(root1.right, root2.left);
    }

    // Public function to check if the
    // entire binary tree is symmetric
    public boolean isSymmetric(Node root) {
        // Check if the tree is empty
        if (root == null) {
            // An empty tree is
            // considered symmetric
            return true;
        }
        // Call the utility function
        // to check symmetry of subtrees
        return isSymmetricUtil(root.left, root.right);
    }
}

public class Main {
    // Function to print the Inorder
    // Traversal of the Binary Tree
    private static void printInorder(Node root) {
        if (root == null) {
            return;
        }
        printInorder(root.left);
        System.out.print(root.data + " ");
        printInorder(root.right);
    }

    public static void main(String[] args) {
        // Creating a sample binary tree
        Node root = new Node(1);
        root.left = new Node(2);
        root.right = new Node(2);
        root.left.left = new Node(3);
        root.right.right = new Node(3);
        root.left.right = new Node(4);
        root.right.left = new Node(4);

        Solution solution = new Solution();

        System.out.print("Binary Tree (Inorder): ");
        printInorder(root);
        System.out.println();

        boolean res = solution.isSymmetric(root);

        if (res) {
            System.out.println("This Tree is Symmetrical");
        } else {
            System.out.println("This Tree is NOT Symmetrical");
        }
    }
}