BFSofBinarySearchTree.java

import java.util.LinkedList;
import java.util.Queue;

class TreeNode {
    int data;
    TreeNode left;
    TreeNode right;

    public TreeNode(int data) {
        this.data = data;
        this.left = null;
        this.right = null;
    }
}

public class BSTBFS {
    public static void bfs(TreeNode root) {
        if (root == null) {
            return;
        }

        Queue<TreeNode> queue = new LinkedList<>();
        queue.offer(root);

        while (!queue.isEmpty()) {
            TreeNode current = queue.poll();
            System.out.print(current.data + " ");

            if (current.left != null) {
                queue.offer(current.left);
            }

            if (current.right != null) {
                queue.offer(current.right);
            }
        }
    }

    public static void main(String[] args) {
        TreeNode root = new TreeNode(5);
        root.left = new TreeNode(3);
        root.right = new TreeNode(8);
        root.left.left = new TreeNode(2);
        root.left.right = new TreeNode(4);
        root.right.left = new TreeNode(6);
        root.right.right = new TreeNode(9);

        System.out.println("Breadth-First Search (BFS) of the BST:");
        bfs(root);
    }
}