Returning a reference to an inner class : Nested Classes « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. Nested Classes

class MyClass {
  private class ClassB implements B {
    private int i = 11;

    public int value() {
      return i;
    }
  }

  protected class ClassA implements A {
    private String label;

    private ClassA(String whereTo) {
      label = whereTo;
    }

    public String readLabel() {
      return label;
    }
  }

  public A dest(String s) {
    return new ClassA(s);
  }

  public B cont() {
    return new ClassB();
  }
}

public class MainClass {
  public static void main(String[] args) {
    MyClass p = new MyClass();
    B c = p.cont();
    A d = p.dest("A");
  }
}

interface B {
  int value();
}

interface A {
  String readLabel();
}