The following code shows how to responsive grid for three size devices.
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap-theme.min.css">
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script
src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<!-- w ww .j a v a 2s. c o m-->
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12 text-center">
<h1>My First Bootstrap Blog</h1>
</div>
</div>
<hr>
<div class="row">
<div class="col-md-4 col-sm-6 col-xs-12">
<h3>Post Title 1</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </p>
</div>
<div class="col-md-4 col-sm-6 col-xs-12">
<h3>Post Title 2</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </p>
</div>
<div class="col-md-4 col-sm-6 col-xs-12">
<h3>Post Title 3</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </p>
</div>
<div class="col-md-4 col-sm-6 col-xs-12">
<h3>Post Title 4</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </p>
</div>
<div class="col-md-4 col-sm-6 col-xs-12">
<h3>Post Title 5</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </p>
</div>
<div class="col-md-4 col-sm-6 col-xs-12">
<h3>Post Title 6</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </p>
</div>
</div>
</div>
</body>
</html>