public boolean treesSymmetric(treeNode leftRoot, treeNode rightRoot){
        if (leftRoot == null && rightRoot == null)
            return true;
        
        if (leftRoot == null || rightRoot == null)
            return false;
            
        return ( leftRoot.value == rightRoot.value && 
        treesSymmetric(leftRoot.rightLeaf, rightRoot.leftLeaf) && 
        treesSymmetric(leftRoot.leftLeaf, rightRoot.rightLeaf));
    }