Mirroring a Binary Tree

public static void mirror( Node root ) {

 Stack<Node> nodes = new Stack<Node>( );
 nodes.push( root );

 while( ! nodes.empty( ) ) {

 Node currentNode = nodes.pop( );

 // Traverse the left subtree.
 if( currentNode.left != null ) {
 nodes.push( currentNode.left );
 }

 // Traverse the right subtree.
 if( currentNode.right != null ) {
 nodes.push( currentNode.right );
 }

 // Swap the left node with the right node.
 Node tempNode = currentNode.left;
 currentNode.left = currentNode.right;
 currentNode.right = tempNode;
 }
 }