/*  TestIntList.java
  
    Test the integer list class.
  
    Bruce M. Bolden
    May 18, 2000              
    Revised: December 1, 2003
    http://www.cs.uidaho.edu/~bruceb/
 */

import java.io.*;

class TestIntList
{
   public static void main( String[] args )
   {
       IntList  list1 = new IntList( 1 );  // , null
       System.out.println( list1.head() );

       //IntList  list2 = new IntList( 2, list1 );
       //IntList  list3 = new IntList( 3, list2 );
       
       //list1 = new IntList( 2, list1 );
       //list1 = new IntList( 3, list1 );

       //PrintIntList( list3 );
       
       list1 = new IntList( 3, new IntList( 2, list1 ));
       System.out.print( "list1: " );
       list1.print();
       
       System.out.print( "list1: " );
       list1.print();
   }
} 


/*  IntList.java */

class IntList
{
   int  value;
   IntList  next;

       //  Constructors
   IntList( int x )
   {
      value = x;
      next  = null;
   }

   IntList( int x, IntList aList )
   {
      value = x;
      next  = aList;
   }

       /**  int value:  data at front of list  */
   int head()
   {
      return  value;
   }
       /**  list:  remainder of list  */
   IntList tail()
   {
      return  next;
   }

   boolean empty()
   {
      return( this == null );
   }

   void print()
   {
       System.out.println( "print()" );
       
       if( this != null )
       {
           System.out.print( "{ " );
           System.out.print( value );

           IntList  tmpList = next;
           while( tmpList != null )
           //while( !tmpList.empty() )
           {
               System.out.print( ", " );
               System.out.print( tmpList.head() );
               tmpList = tmpList.tail(); 
           }
	       
           System.out.println( " }" );
       }
   }
}