A sample IBM Bluemix app which lets you ask travel or healthcare-related questions using Watson's Question and Answer API. Here's where you can try out the app, and see this guide for how to get started with your own.
I made modifications in src/com/ibm/cloudoe/samples/DemoServlet.java to add the CSS class for confidence, and styled it in WebContent/css/style.css and WebContent/index.jsp.