Question $1$

$[25$ marks$]$

Write a Java Graphical User Interface $($GUI$)$ application that prompts the user to enter the diameter of a circle in a textbox. Upon clicking the 'Calculate' button, the application should calculate and display the area of the circle in another textbox. Clicking the 'Clear' button should clear the content in the textboxes, and clicking the 'Close' button should close the application.

Rubric:

$\backslash$table$[[$Application$,$Functionality,Marks$],[\backslash$table$[[$Buttons:$],[$Calculate $-$ variable declaration & initialization.$],[$Calculations $($using formulas$)],[$radius $=$ diameter $/2],[$area $=$ PI x $($radius x radius$)],[$Data type casting$],[$Program$],[$execution and$]],\backslash$table$[[$Display all calculated values$]],],[$Reset$/$Clear$,(10$ marks$)]]$