ArrayUtil.java

import java.util.Random;

/**
   This class contains utility methods for array 
   manipulation.
*/  
public class ArrayUtil
{ 
   /**
      Creates an array filled with random values.
      @param length the length of the array
      @param n the number of possible random values
      @return an array filled with length numbers between
      0 and n - 1
   */
   public static int[] randomIntArray(int length, int n)
   {  
      int[] a = new int[length];      
      for (int i = 0; i < a.length; i++)
         a[i] = generator.nextInt(n);
      
      return a;
   }

   private static Random generator = new Random();
}