// School4.java
// contains some people
// This class tries to break encapsulation, but cannot because Person4 class 
// does not return a pointer
import javax.swing.JOptionPane;

public class school4 {

   public static void main( String args[] )
   {
      Person4 pArray[] = new Person4[2];
      pArray[0] = new Student4();  // calls Student4 constructor
      pArray[1] = new Faculty4();  // calls Faculty4 constructor
      Student4 joe;
      Faculty4 jane;
      int joeClasses[];

      // append String version of time to String output
      String output = "Before initializing Joe. \nJoe's first name is:  " +
         pArray[0].getFirst() + "\nJoe's last name is:  " +
         pArray[0].getLast() + "\nJoe's age is:  " + pArray[0].getAge() ;

      joe = (Student4) pArray[0];
      joeClasses = joe.getClasses();
      output += "\nJoe's classes are:";
      for (int i = 0; i < joe.getNumClasses(); i++)  {
	 output += "\t " + joe.getClass(i);
      }

      // change Joe's name and add classes
      pArray[0].setFirst("Joe"); 
      pArray[0].setLast("Brown"); 
      pArray[0].setAge(25);
      joe.addClass(312101);
      joe.addClass(309130);
      joe.addClass(340112);
      output += "\n\nRecord type:  " + pArray[0].getType();
      output += "\n\nJoe's first name after changing is: " + 
         pArray[0].getFirst() + "\nJoe's last name is:  " +
         pArray[0].getLast() + "\nJoe's age is:  " + pArray[0].getAge(); 
      output += "\nJoe's classes before refetching are:";
      // this works because pArray[0] is a pointer to what pArray[0].getClasses() returns!
      // Note how encapsulation is maintained!
      for (int i = 0; i < joe.getNumClasses(); i++)  {
	 output += "\t " + joe.getClass(i);
      }
      // see what happens!  Encapsulation is not broken!
      joeClasses[5] = 9992222;
      output += "\n5th index is: " + joe.getClass(5);
      // now refetch the information
      joeClasses = joe.getClasses();
      output += "\nJoe's classes after refetching are:";
      for (int i = 0; i < joe.getNumClasses(); i++)  {
	 output += "\t " + joe.getClass(i);
      }

      // get jane faculty object
      jane = (Faculty4) pArray[1];
      // change Jane's name and add classes
      pArray[1].setFirst("Jane"); 
      pArray[1].setLast("Jones"); 
      pArray[1].setAge(21);
      jane.addClass(212101);
      jane.addClass(209130);
      jane.addClass(240112);
      output += "\n\nRecord type:  " + pArray[1].getType();
      output += "\n\nJane's first name after changing is: " + 
         pArray[1].getFirst() + "\nJane's last name is:  " +
         pArray[1].getLast() + "\nJane's age is:  " + pArray[1].getAge(); 
      output += "\nJane's classes are:";

      int janeClasses[];
      janeClasses = jane.getClasses();
      for (int i = 0; i < jane.getNumClasses(); i++)  {
	 output += "\t " + jane.getClass(i);
      }

      JOptionPane.showMessageDialog( null, output,
         "Testing Class Time1", JOptionPane.INFORMATION_MESSAGE );

      System.exit( 0 );

   } // end main

} // end class school4


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 * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and               *
 * Prentice Hall. All Rights Reserved.                                    *
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