// Student4.java
// Student class extends the Person4 class and adds an array for classes
// This class clones the class array when it returns it; maintains encapsulation

public class Student4 extends Person4 {

   private int lastClass;          // age 
   private int classes[];     // classes taking

   // Student4 constructor initializes each instance variable including classes
   public Student4()
   {
      super( );
      int temp[] = {0};
      classes = new int[20];
      setStudent(temp);
   }

   // set a new Student4 value 
   // validity checks on the age; set invalid values to 20
   public void setStudent( int classes[] )
   {
      int i;

      for (i = 0; i < classes.length; i++)  {
	      this.classes[i] = classes[i];
      }
      lastClass = i - 1;
   }

   public int[] getClasses()
   {
       return classes.clone();
   }
   
   public void addClass(int newClass)
   {
	   if (lastClass == classes.length - 1)
		   return;
	   else if (classes[lastClass] == 0) 
		   classes[lastClass] = newClass;
	   else
	  	classes[++lastClass] = newClass; 
   }
   
   public int getNumClasses()
   {
	   return lastClass + 1;
   }

   public int getClass(int theElement)
   {
	   return classes[theElement];
   }

   public String getType( ){
	   return "Student";
   }

} // end class Student4

/**************************************************************************
 * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and               *
 * Prentice Hall. All Rights Reserved.                                    *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 *************************************************************************/