GWT: load HTML when click a button

How to load a HTML Page on clicking a button in GWT ?
To achieve this, we have various approaches.
we will see one by one.

Approach - 1:

import com.google.gwt.user.client.Window;

Window.Location.replace("newURL");.

Reference:

http://stackoverflow.com/questions/2612490/load-html-when-click-a-button-gwt