570: Mainline

The following combination is based on the combination shown in Segment 548, and reads the same sort of data file, but differs in that the combination stores Movie instances in a vector, rather than an array. The highlighted expressions and statements identify the principle differences:

import java.io.*;
import java.util.*;
public class Demonstrate {
 public static void main(String argv[]) throws IOException {
  Vector mainVector = Auxiliaries.readData("input.data");       
  int size = mainVector.size();                                 
  for (int counter = 0; counter < size; ++counter) {
   System.out.println(
    ((Movie) mainVector.elementAt(counter)).rating()            
   );  
  }  
 } 
} 

import java.io.*;
import java.util.*;
public class Auxiliaries {
 public static Vector readData(String fileName) throws IOException { 
  FileInputStream stream = new FileInputStream(fileName);
  InputStreamReader reader = new InputStreamReader(stream);
  StreamTokenizer tokens = new StreamTokenizer(reader);
  Vector v = new Vector();                                           
  while (tokens.nextToken() != tokens.TT_EOF) {
   int x = (int) tokens.nval;
   tokens.nextToken(); int y = (int) tokens.nval;
   tokens.nextToken(); int z = (int) tokens.nval;
   v.addElement(new Movie(x, y, z));                                 
  }
  stream.close();
  return v;                                                          
 } 
}