// FILE: BagDemonstration.java
// This small demonstration program shows how to use the IntArrayBag class 
// from the edu.colorado.collections package.

import java.util.Scanner;
import edu.colorado.collections.IntArrayBag;

public class BagDemonstration
{
   private static Scanner stdin = new Scanner(System.in);
   
   public static void main(String[ ] args)
   {
      IntArrayBag ages = new IntArrayBag( );

      getAges(ages);
      checkAges(ages);
      System.out.println("May your family live long and prosper.");
   }

   // The getAges method prompts the user to type in the ages of family 
   // members. These ages are read and placed in the ages bag, stopping when
   // the user types a negative number. This simple demonstration does not
   // worry about the possibility of running out of memory.
   public static void getAges(IntArrayBag ages)
   {
      int userInput; // An age from the user's family

      System.out.println("Type the ages of your family members.");
      System.out.println("Type a negative number at the end and press return.");
      userInput = stdin.nextInt( );
      while (userInput >= 0)
      { 
         ages.add(userInput);
         userInput = stdin.nextInt( );
      }
   }

   
   // The checkAges method prompts the user to type in the ages of family
   // members once again. Each age is removed from the ages bag when it is
   // typed, stopping when the bag is empty (or the user types a negative
   // number).
   public static void checkAges(IntArrayBag ages)
   {
       int userInput; // An age from the user's family

       System.out.print("Type those ages again. ");
       System.out.println("Press return after each age.");
       while (ages.size( ) > 0)
       {
	  System.out.print("Age: ");
          userInput = stdin.nextInt( );
          if (ages.countOccurrences(userInput) == 0)
             System.out.println("No, that age does not occur!");
          else
          {
             System.out.println("Yes, I've got that age and will remove it.");
             ages.remove(userInput);
          }
       }
   }

}