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Code Example 1

// Java program for recursive level order traversal in spiral form 
  
/* A binary tree node has data, pointer to left child  
   and a pointer to right child */
class Node { 
    int data; 
    Node left, right; 
  
    public Node(int d) 
    { 
        data = d; 
        left = right = null; 
    } 
} 
  
class BinaryTree { 
    Node root; 
  
    // Function to print the spiral traversal of tree 
    void printSpiral(Node node) 
    { 
        int h = height(node); 
        int i; 
  
        /* ltr -> left to right. If this variable is set then the 
           given label is traversed from left to right */
        boolean ltr = false; 
        for (i = 1; i <= h; i++) { 
            printGivenLevel(node, i, ltr); 
  
            /*Revert ltr to traverse next level in opposite order*/
            ltr = !ltr; 
        } 
    } 
  
    /* Compute the "height" of a tree -- the number of 
    nodes along the longest path from the root node 
    down to the farthest leaf node.*/
    int height(Node node) 
    { 
        if (node == null) 
            return 0; 
        else { 
  
            /* compute the height of each subtree */
            int lheight = height(node.left); 
            int rheight = height(node.right); 
  
            /* use the larger one */
            if (lheight > rheight) 
                return (lheight + 1); 
            else
                return (rheight + 1); 
        } 
    } 
  
    /* Print nodes at a given level */
    void printGivenLevel(Node node, int level, boolean ltr) 
    { 
        if (node == null) 
            return; 
        if (level == 1) 
            System.out.print(node.data + " "); 
        else if (level > 1) { 
            if (ltr != false) { 
                printGivenLevel(node.left, level - 1, ltr); 
                printGivenLevel(node.right, level - 1, ltr); 
            } 
            else { 
                printGivenLevel(node.right, level - 1, ltr); 
                printGivenLevel(node.left, level - 1, ltr); 
            } 
        } 
    } 
    /* Driver program to test the above functions */
    public static void main(String[] args) 
    { 
        BinaryTree tree = new BinaryTree(); 
        tree.root = new Node(1); 
        tree.root.left = new Node(2); 
        tree.root.right = new Node(3); 
        tree.root.left.left = new Node(7); 
        tree.root.left.right = new Node(6); 
        tree.root.right.left = new Node(5); 
        tree.root.right.right = new Node(4); 
        System.out.println("Spiral order traversal of Binary Tree is "); 
        tree.printSpiral(tree.root); 
    } 
} 
  
// This code has been contributed by Mayank Jaiswal(mayank_24)

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