title: Designing a Calculator web aplication in Java
body: <p>I am making a Java web application called Calculator.
  I'm using JSP, but I am not sure how to move forward.</p>
  
  <p>Actually the problem is, I have designed a calculator UI and I want to display the <em>number</em> clicked in the text field on the same page.</p>
  
  <p>How do I do this?<br>
  Please help me with an example.</p>