RandomUtil.java

/*
 * $Id$
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 * Copyright 2006, The jCoderZ.org Project. All rights reserved.
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 *      its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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package org.jcoderz.commons.util;

import org.jcoderz.commons.ArgumentMalformedException;

/**
 * Utility class that provides random related utility functions.
 *
 * @author Michael Griffel
 */
public final class RandomUtil
{
   private RandomUtil ()
   {
      // utility class - only static methods.
   }

   /**
    * Returns a random long number between the value <tt>min</tt>
    * and the value <tt>max</tt>.
    * @param min the minimum value.
    * @param max the maximum value.
    * @return a random long number between the value <tt>min</tt>
    *       and the value <tt>max</tt>.
    * @throws ArgumentMalformedException if the value <tt>min</tt>
    *       is greater than the value <tt>max</tt>
    */
   public static long random (long min, long max)
         throws ArgumentMalformedException
   {
      if (min > max)
      {
         throw new ArgumentMalformedException("min", String.valueOf(min),
               "Value min " + min + " must be lesser than value max " + max);
      }
      return (long) (Math.random() * (max - min) + min);
   }
}