Check if Tree is Isomorphic

class Solution   { 
    // Return True if the given trees are isomotphic. Else return False.
    boolean isIsomorphic(Node root1, Node root2)   { 
        if(root1 == null && root2 == null) 
            return true;
        
        if(root1 == null || root2 == null)
            return false;
        
        return (root1.data == root2.data) && 
        ((isIsomorphic(root1.left, root2.left) && isIsomorphic(root1.right, root2.right)) ||
        (isIsomorphic(root1.left, root2.right) && isIsomorphic(root1.right, root2.left)));
    }
    
}