AngularJS click to change classes

HTML

<div ng-controller="Ctrl">
    <div ng-click="class1='selected'; class2=''" ng-class="class1">click me</div>
    <div ng-class="class2" class="other">hi</div>
    <button ng-class="{selected: toggle}" ng-click="c">toggle button</button>
</div>

CSS

.selected { border-top: 1px solid red }
.other { border-right: 2px dashed green; }

JavaScript

function Ctrl($scope) {
    $scope.class2 = 'selected';
    $scope.toggle = true;
}