Design of an Application

Let's design and implement a GUI application that converts a temperature expressed in Fahrenheit into Celsius. As usual, there are three parts to the design:

1. The Graphical User Interface.
2. Listener methods.
3. Application methods.

Let us first look at the application methods. The formula for converting fahrenheit into Celsius is this:

celsius = (fahrenheit - 32) * 5/9

This is algebra, not Java. Although the algebra looks much like Java some more design decisions are needed.