OO Java

OoFoo.java

abstract class OoFoo {
  abstract void handle();

  static class Bar extends OoFoo {
    private int bar;

    private Bar(int bar) {
      this.bar = bar;
    }

    @Override
    void handle() {
      System.out.println("I have " + bar + " bars");
    }
  }

  static class Baz extends OoFoo {
    private String baz;

    private Baz(String baz) {
      this.baz = baz;
    }

    @Override
    void handle() {
      System.out.println("I have the " + baz + " baz");
    }
  }

  public static void main(String[] args) {
    new Bar(42).handle();
    new Baz("Luhrmann").handle();
  }
}