Hi everyone

I have created separate four class:

and I want to setup a main menu, so if a user press 1, then it goes to the Annulus Class, if a user press 2, it goes to Diameters Class and if a user press 3, it goes to the Circumference class.

I've spent all day trying to figure it out how I can set up a menu. I've attach my work what I've done so far. Can you help me please?

Many thanks!

Code:
public class MainMenu

{
	public static CheckLinesIn CLI = new CheckLinesIn();
	public static Annulus A = new Annulus();
	public static Diameters D = new Diameters();
	public static Circumferences C = new Circumferences();
	

public static void menu (String[] args)
{