// Person.java
// Person class declaration creates a person object
// This version of Person violates its encapsulation by returning the classes array.  Since objects are really
// pointers, this gives the user a pointer to an internal data structure!
import java.text.DecimalFormat; 

public class Person extends Object {
   private String First;     // first name
   private String Last;	     // last name
   private int age;          // age 
   private int lastClass;          // age 
   private int classes[];     // classes taking

   // Person constructor initializes each instance variable to zero or empty; 
   // ensures that each Time1 object starts in a consistent state
   public Person()
   {
	   int temp[] = {0};
      classes = new int[20];
      setPerson( "George", "Smith", 20, temp );
   }

   // set a new Person value 
   // validity checks on the age; set invalid values to 20
   public void setPerson( String First, String Last, int age, int classes[] )
   {
      int i;

      this.First = First;
      this.Last = Last;
      this.age =  ( ( age >= 0 && age < 100 ) ? age : 20 );
      for (i = 0; i < classes.length; i++)  {
	      this.classes[i] = classes[i];
      }
      lastClass = i - 1;
   }

   // get first name
   public String getFirst()
   {

      return First;
   }

      // get last name
   public String getLast()
   {

      return Last;
   }
   
   public int getAge()
   {
      return age;
   }

   // This method will break encapsulation!  classes is really a pointer, so the user can directly access
   // an internal array!
   public int[] getClasses()
   {
       return classes;
   }

   public void setFirst(String First)
   {
	   this.First = First;
   }
   
   public void setLast(String Last)
   {
	   this.Last = Last;
   }
   
   public void setAge(int age)
   {
	   this.age = age;
   }
   
   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];
   }

} // end class Person

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