import java.util.Random;

/* An instance of this class (which has no instance variables) has a
** method that produces an array containing pseudo-randomly generated
** integers.
*/
public class RandIntArrayMaker {

   /* Returns an array of the specified length containing pseudo-randomly
   ** generated integers in the specified range [bottom..top] using the
   ** given Random object.
   ** pre: length >= 0, bottom <= top, rand != null
   */
   public int[] randomIntArray(int length, int bottom, int top, Random rand) {
      int[] result = new int[length];
      int topBotDiff = top - bottom + 1;
      for (int i=0; i != result.length; i++) {
         result[i] = bottom + rand.nextInt(topBotDiff);
      }
      return result;
   }

   /* Returns an array of the specified length containing pseudo-randomly
   ** generated integers in the specified range [bottom..top] using a
   ** Random object created using the given seed.
   ** pre: length >= 0, bottom <= top
   */
   public int[] randomIntArray(int length, int bottom, int top, int seed) {
      return randomIntArray(length, bottom, top, new Random(seed));
   }

   /* Returns an array of the specified length containing pseudo-randomly
   ** generated Integer objects in the specified range [bottom..top] using 
   ** the given Random object.
   ** pre: length >= 0, bottom <= top, rand != null
   */
   public Integer[] randomIntegerArray(int length, int bottom, int top, Random rand) {
      return intArrayToIntegerArray(randomIntArray(length, bottom, top, rand));
   }

   /* Returns an array of the specified length containing pseudo-randomly
   ** generated Integer objects in the specified range [bottom..top] using a
   ** Random object created using the given seed.
   ** pre: length >= 0, bottom <= top
   */
   public Integer[] randomIntegerArray(int length, int bottom, int top, int seed) {
      return randomIntegerArray(length, bottom, top, new Random(seed));
   }


   // private
   // -------

   /* Returns a duplicate of the given array, except that each element is of
   ** type Integer rather than int.
   */
   private Integer[] intArrayToIntegerArray(int[] a) {
      int N = a.length;
      Integer[] result = new Integer[N];
      for (int i=0; i != N; i++) 
         { result[i] = a[i]; }  // exploits autoboxing
      return result;
   }
}