ArrayUtil.java 

    1	import java.util.Random;
    2	
    3	/**
    4	   This class contains utility methods for array
    5	   manipulation.
    6	*/
    7	public class ArrayUtil
    8	{
    9	   /**
   10	      Creates an array filled with random values.
   11	      @param length the length of the array
   12	      @param n the number of possible random values
   13	      @return an array filled with length numbers between
   14	      0 and n - 1
   15	   */
   16	   public static int[] randomIntArray(int length, int n)
   17	   {
   18	      int[] a = new int[length];
   19	      for (int i = 0; i < a.length; i++)
   20	         a[i] = generator.nextInt(n);
   21	
   22	      return a;
   23	   }
   24	
   25	   private static Random generator = new Random();
   26	}
   27