Check for identical tree

IdenticalTree.java

class Node 
{
	int data;
	Node left, right;

	Node(int item) 
	{
		data = item;
		left = right = null;
	}
}

class BinaryTree 
{
	Node root1, root2;

	boolean identicalTrees(Node a, Node b) 
	{
		/*1. both empty */
		if (a == null && b == null)
			return true;
			
		/* 2. both non-empty -> compare them */
		if (a != null && b != null) 
			return (a.data == b.data
					&& identicalTrees(a.left, b.left)
					&& identicalTrees(a.right, b.right));

		/* 3. one empty, one not -> false */
		return false;
	}

	/* Driver program to test identicalTrees() function */
	public static void main(String[] args) 
	{
		BinaryTree tree = new BinaryTree();

		tree.root1 = new Node(1);
		tree.root1.left = new Node(2);
		tree.root1.right = new Node(3);
		tree.root1.left.left = new Node(4);
		tree.root1.left.right = new Node(5);

		tree.root2 = new Node(1);
		tree.root2.left = new Node(2);
		tree.root2.right = new Node(3);
		tree.root2.left.left = new Node(4);
		tree.root2.left.right = new Node(5);

		if (tree.identicalTrees(tree.root1, tree.root2))
			System.out.println("Both trees are identical");
		else
			System.out.println("Trees are not identical");

	}
}