Fib generator

fib.java

import java.util.Iterator;

class HelloWorldApp {
  public static void main(String[] args) {

    Iterable<Integer> fibo = new Iterable<Integer>() {
      @Override
      public Iterator<Integer> iterator() {
        return new Iterator<Integer>() {
          int a = 0;
          int b = 1;
          int total;

          @Override
          public boolean hasNext() {
            return true;
          }

          @Override
          public Integer next() {
            int old_a = a;
            a = b;
            b = old_a + b;
            return old_a;
          }

          @Override
          public void remove() {
            throw new UnsupportedOperationException();
          }
        };
      }
    };

    Iterator<Integer> it = fibo.iterator();
    int n = 0;
    while (n++ < 25) {
      System.out.print(it.next() + " ");
    }
  }

}