//
// example of inner class (showing access to enclosing object 
//      and usefulness in implementing java.util.Enumeration)
//

import java.util.Enumeration ;
import java.util.NoSuchElementException ;

class MyClass2 {

        String[] someWords ;

        MyClass2(String[] someWords) {
                this.someWords = someWords ;
        }

        // method to return an "enumerator object" (object of type
        //      java.util.Enumeration)

        Enumeration elements() {
                return new Enum() ;     // return instance of inner class
        }

        // inner class for implementing java.util.Enumeration interface

        class Enum implements Enumeration {

                // within this class, have access to instance variable
                //      someWords

                // instance variable position is index of next
                //      element of someWords to print

                int position = 0 ;

                public boolean hasMoreElements() {
                        return (position < someWords.length) ;
                }

                public Object nextElement() {
                        if (position >= someWords.length) 
                                throw new NoSuchElementException() ;
                        return someWords[position++] ;
                }
        }

}

public class Nest2 {

        public static void main(String[] args) {

                MyClass2 o1 = new MyClass2(new String[] 
                        { "two", "four", "six", "eight" } ) ;

                Enumeration e = o1.elements() ;
                while (e.hasMoreElements()) 
                        System.out.println(e.nextElement()) ;
        }
}