543: Mainline

Now, you can create a movie array in main, and can hand that array to the readData class method, defined in the Auxiliaries class. Evidently, the readData method adds elements to the array and returns it, whereupon a for loop displays ratings. Note that the main program determines that there are no more movies with which to deal by looking for null, as explained in Segment 522:

import java.io.*; 
public class Demonstrate { 
 public static void main(String argv[]) throws IOException { 
  Movie mainArray [] = new Movie [100];  
  mainArray = Auxiliaries.readData(mainArray); 
  Movie m;  
  for (int counter = 0; (m = mainArray[counter]) != null; ++counter) {  
   System.out.println(m.rating());  
  }  
 } 
}