Inner and Nested Classes: Local 2

/**
 *  This code is from the book:
 *  Winder, R and Roberts, G (1998)
 *  Developing Java Software</em>
 *  John Wiley & Sons.
 *  It is copyright (c) 1997 Russel Winder
 *  and Graham Roberts.
 */

interface Thing{
  public void test();
}

class l1Local2{//Class9
  private String name = "l1Local2";

  public Thing f(final String h, String w){
    int j = 20;
    final int k = 30;

    class Local implements Thing{
      public void test(){
        //OK as h is final
        System.out.println(h);
        //Cannot do this as w is not final
        //System.out.println(w); //Error

        //Cannot do this as j is not final
        //System.out.println(j); //Error

        //OK k is final
        System.out.println(k);

        //Cannot do this as i is not yet declared
        //System.out.println(i); //Error

        //Like a member class, instance variables of
        //the enclosing object can be accessed.
        //They don't need to be final.
        System.out.println(name);
      }
    }

    Local l = new Local();
    final int i = 10;

    return l;
  }

  public static void main(String[] args){
    l1Local2 c9 = new l1Local2();

    //Get a reference to a local class object
    //conforming to type Thing
    Thing t = c9.f("hello", "world");
    //Call a method of the local class object to
    //verify its state
    t.test();
  }
}
/******** sample compilation & run *******
# javac l1Local2.java 
# java l1Local2
hello
30
l1Local2
# 
******************************************/