Question

I am trying to access a function from a class from within a class it was not created in.

Basically I have class A which can do b.refresh();

b obviously contains that function known as refresh. I now want class C to access it.

So in my mind it would be something like c.b.refresh(); but this clearly doesn’t work.

What would I need to do to make it work? Only one instance of B is allowed.

Main class:

B b = new b();
b.refresh();
C c = new C();

Inside C:

function() {
//want to access the same b from Main class.
}

Answer 1

I assume you want to share the B instance so :

public class C {

   private B b;

   C(B b) {
      this.b = b;
   }

   public refresh() {
      b.refresh();
  }
}

now you can do :

B b = new B();
C c = new C(b);
c.refresh();

And the same you can do with the A class passing the same B instance as :

A a = new A(b);