Untitled

var app = angular.module("AddObject", ['ui.router']);
app.config(
function ($stateProvider, $urlRouterProvider) {
    $urlRouterProvider.otherwise('/first');

    $stateProvider.state('first', {
            url: '/first',
            templateUrl: 'views/first/first.html',
            controller: 'firstController'
        })
        .state('second', {
            url: '/second',
            templateUrl: 'views/second/second.html',
            controller: 'secondController'
        })
}
);

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>AddObject</title>

<script src="js/angular.js"></script>
<script src="js/angular-ui-router.js"></script>
<script src="js/app.js"></script>

<script src="view/first/first.js"></script>
<script src="view/second/second.js"></script>

<script src="js/router.js"></script>
</head>
<body ng-app="AddObject">

<a ui-sref="first">first</a>
<a ui-sref="second">second</a>

<div ui-view>

</div>

</body>
</html>