util.java

jacckit的说明文档,介绍了使用说明,各种接口的使用,是个好的帮助文章

/*
 * Copyright 2003-2004, Franz-Josef Elmer, All rights reserved
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details
 * (http://www.gnu.org/copyleft/lesser.html).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcckit.util;

/**
 * Collection of static utility methods.
 * 
 * @author Franz-Josef Elmer
 */
public class Util {
  /** Private constructor to prevent instanciation of this class. */ 
  private Util() {}

  /**
   *  Returns the natural logarithm of the specified number if
   *  <tt>logScale</tt> is true.
   *  @return <tt>x</tt> if <tt>logScale == false</tt>.
   */
  public static double log(double x, boolean logScale) {
    return logScale ? Math.log(x) : x;
  }

  /**
   *  Returns the exponential function of the specified number if
   *  <tt>logScale</tt> is true.
   *  @return <tt>x</tt> if <tt>logScale == false</tt>.
   */
  public static double exp(double x, boolean logScale) {
    return logScale ? Math.exp(x) : x;
  }
}