We can change the order of our built-in grid columns with .col-lg-push-* and .col-lg-pull-* modifier classes.
<!DOCTYPE HTML>
<html>
<head>
<link href="http://java2s.com/style/bootstrap.min.css" rel="stylesheet">
</head><!-- w w w.j a v a 2s .c om-->
<body style='margin:20px;'>
<div class="row">
<div class="col-lg-9 col-lg-push-3">9</div>
<div class="col-lg-3 col-lg-pull-9">3</div>
</div>
</body>
</html>