class ArrayOps
{
   public ArrayOps()
   {

   }
   
   // Copy source to target
   public void copy (int[] source, int[] target)
   {    
      for (int count=0; count < source.length; count++)
         target[ count ] = source[ count ];
   }
  
   public void printList (int[] list)
   /* list is a reference parameter.  list is the same array as
      array data in the main method */
   {
      int index;
   
      for (index = 0; index < list.length; index++)
         System.out.print( list[index] + "   ");
      System.out.println();
      System.out.println();
   }
  
   public void squareList (int[] list)
   /* Array list is a local alias for array data in the main method.  Any 
      reference to local list is a reference to array data in function main.  */
   {
      int index;
  
      for (index=0; index < list.length; index++)
         list[index] = list[index] * list[index];
   }
  
   
   public void rotateList (int[] list)
   /* This function is working with a local copy of the array passed 
      as an argument.  Changes to local array list will have no effect 
      on the array data in the calling method.  This function will shift each 
      value one cell to the right.  The value in list[list.length-1] will be 
      moved to list[0].  Before the function is completed, printList will 
      be called.  The point of this function is to illustrate an array as 
      a value parameter.  */
   {
       int temp = list[list.length-1];
      
       int[] listCopy = new int[ list.length ];
      
       copy(list, listCopy);
             
       for (int loop = listCopy.length-1; loop > 0; loop--)
          listCopy[loop] = listCopy[loop-1];
       listCopy[0] = temp;
      
       System.out.println("Inside of rotateList:  ");
       printList (listCopy);

   }
}

public class ArrayAsParam
{
    public static void main (String[] args)
    {
        final int MAX = 6;

        ArrayOps arrayOps = new ArrayOps();
        
        int[] data = new int[MAX];
        int loop;
     
        for (loop=0; loop < MAX; loop++)
           data[loop] = loop;   // initialize array
        System.out.println("Array initialized:  ");

        arrayOps.printList(data);   // print array in ascending order
        arrayOps.squareList (data);
        System.out.println("Array after call of squareList:  ");
        arrayOps.printList (data);
        arrayOps.rotateList (data);
        System.out.println("Array after call of rotateList:  ");
        arrayOps.printList (data);  // print list again
    }
}