1.4-Software-Development-Principles

Generics

Creating a Generic OptionSelector

During the module OGP you created an OptionSelector in week 3. The problem with that implementation is that it only works for a simple type. To use it for another type you would have to rebuild your code.

Think what you can do with a generic type.

public class OptionSelector<T> {
	public void addOption(T option);
	public void printMenu(boolean showQuit);
	public T selectOption();
}

Assignment

• Refactor your original OptionSelector class.
  • Allow options of the correct type to be added.
  • Show the list of options counting from 1 (Be polite to your user.)
• Replace all references to the original type you chose with T.
• When selecting an option through the menu, return the selected option object.

• When a quit option is shown. The choice for ‘0’ returns null.

• Confirm that your selector works with a list of String options.
• Confirm that your selector works with any other type.