title: Insert Contents of 1 Zip into another Zip with java
body: <p>Okay, So I need a way to take <code>A.zip</code> and insert its contents into <code>b.zip</code> In java. Also I need it to overwrite any files in <code>b.zip</code> that exist in <code>a.zip</code>.<br><br>
  Now, I've been trying for hours to do this with <a href="http://truezip.java.net" rel="nofollow">TrueZip</a>. And I've tried a billion different ways only to all end In some sort of logic error. It just doesn't seem possible. But yet I know 7-zip can do it. Any help or hints would be vastly appreciated.</p>