576: Mainline

Modifying the Demonstrate definition shown in Segment 570 produces the following:

import java.io.*;
import java.util.*;
public class Demonstrate {
 public static void main(String argv[]) throws IOException {
  Vector mainVector = Auxiliaries.readData("input.data");
  for (Iterator i = mainVector.iterator(); i.hasNext();) {      
   System.out.println(((Movie) i.next()).rating());  
  }  
 } 
}