You will create a simple adding machine (i.e. a calculator that has only an adding function). The adding machine will have 12 buttons: 10 buttons for 0-9, one button for add (and equal), and one button for clear.

Click on the picture (right) to download a sample working adding machine.

Evaluation

• Visual Design: 2 marks
• Basic Functionality (i.e. yours does what the example does): 6 marks
  • number entry (0-9)
  • multidigit numbers
  • addition/equal
  • all clear
• Key Listeners: 2 marks
  • 0 to 9 to enter numbers
  • + and Enter key to add
  • Esc to clear

Note: Use key listeners on the TextField to detect specific keyboard inputs. Click here for reference to Java key listeners in Swing UI.