Question

I have this problem since I’m beginning in OOP programming I want to close one Class from other Class who have been called by this Class I want to close.

EX:

Class Principal call Class Menu and inside menu i close Principal

//Im inside of Principal

Menu mnu = new Menu();

//Now im inside of Menu

public void closePrincipal(){

principal.close();
}

Answer 1

You can pass the reference to the principal class to the menu;

// in your principal

Menu mnu = new Menu(this);

You have to define that constructor in the Menu class:

class Menu{
    private Principal principal;

    public Menu(Principal principal){
      this.principal = principal;
    }
...
}

So when you want to use it in your menu, just do it.

principal.close();