Java convert string to md5 and vise versa
<p>I have java three strings. let say example. </p>

<pre><code>String test = "Hi, ";
String test1 = "this is ";
String test2 = "Java programming!";
</code></pre>

<p>I wanna combine those 3 string and change it to md5 format. How could I do? I use MessageDigest class for one string but i have no idea how to append 3 string before change to md5. And I wanna to change back md5 to string. Do i need external library. </p>