Move magic numbers into constants
Remove debug statements
Fix "Compare Objects With Equals" issues
Reduce complexity of actionPerformed (Menu class) method
Refactor variable name to camel-case
Remove SupressWarning
Refactor initButtons to reduce method length
Eliminate issue: Overridable method "addPanels()" call in constructor
Fix sonar issue: The user-supplied array is stored directly.
Remove empty exception catch block
Document public APIs