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LevelOrderTraversalQueue.java

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package DataStructures.Trees;

import java.util.Queue;

import java.util.LinkedList;

/* Class to print Level Order Traversal */

public class LevelOrderTraversalQueue {

/* Class to represent Tree node */

class Node {

int data;

Node left, right;

public Node(int item) {

data = item;

left = null;

right = null;

}

}

Node root;

/* Given a binary tree. Print its nodes in level order

using array for implementing queue */

void printLevelOrder() {

Queue<Node> queue = new LinkedList<Node>();

queue.add(root);

while (!queue.isEmpty()) {

/* poll() removes the present head.

For more information on poll() visit

http://www.tutorialspoint.com/java/util/linkedlist_poll.htm */

Node tempNode = queue.poll();

System.out.print(tempNode.data + " ");

/*Enqueue left child */

if (tempNode.left != null) {

queue.add(tempNode.left);

}

/*Enqueue right child */

if (tempNode.right != null) {

queue.add(tempNode.right);

}

}

}

}