How to access scala object inside scala class in java?

I have scala class like:

class A {
  object B {
    def c(d: Int) = d + 4
  }
}

How do i access function c from a java code?

Edit: assume that I can't change scala class anyhow.

Edit#2: Here is example of

public class Q {
    public void qwe() {
        A a = new A();
        a.B().c(4); //Cannot resolve method 'B' in 'A'
    }
}

object B from class gets converted to public method B() which you can access as follows:

  A a = new A();
  System.out.println(a.B().c(4));

Under The Hood

A.scala

class A {
  object B {
    def c(d: Int) = d + 4
  }
}

Above class when compiled to java looks like below

scalac A.scala

javap -p A.class

public class A {
  private volatile A$B$ B$module;
  public A$B$ B();
  private final void B$lzycompute$1();
  public A();
}