How can I install additional packages in Java?
<p>I am very new to Java. 
I would like to use some features from package called <code>daj</code></p>

<p>The tutorial code has the following lines.</p>

<pre><code>import daj.*;
import java.util.*;
import java.lang.Math;
import Msg;
</code></pre>

<p>But first and fourth lines produce red underscore such that program cannot compiles.</p>

<p>How can I resolve this problem?</p>
