Demonstration of final constants : final « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. final

/*
 *     file: FinalParameters.java
 *  package: oreilly.hcj.finalstory
 *
 * This software is granted under the terms of the Common Public License,
 * CPL, which may be found at the following URL:
 * http://www-124.ibm.com/developerworks/oss/CPLv1.0.htm
 *
 * Copyright(c) 2003-2005 by the authors indicated in the @author tags.
 * All Rights are Reserved by the various authors.
 *
########## DO NOT EDIT ABOVE THIS LINE ########## */


/**  
 * Demonstration of final constants.
 *
 * @author <a href=mailto:kraythe@arcor.de>Robert Simmons jr. (kraythe)</a>
 * @version $Revision: 1.3 $
 */
public class FinalParameters {
  /** Contains a constant for both equations. */
  private static final double M = 9.3;

  /** 
   * Calculate the results of an equation.
   *
   * @param inputValue Input to the equation.
   *
   * @return result of the equation.
   */
  public double equation2(double inputValue) {
    final double K = 1.414;
    final double X = 45.0;

    double result = (((Math.pow(inputValue, 3.0d) * K) + X) * M);

    double powInputValue = 0;
    if (result > 360) {
      powInputValue = X * Math.sin(result);
    } else {
      inputValue = K * Math.sin(result);
    }

    result = Math.pow(result, powInputValue);
    if (result > 360) {
      result = result / inputValue;
    }

    return result;
  }

  /** 
   * Calculate the results of an equation.
   *
   * @param inputValue Input to the equation.
   *
   * @return result of the equation.
   */
  public double equation2Better(final double inputValue) {
    final double K = 1.414;
    final double X = 45.0;

    double result = (((Math.pow(inputValue, 3.0d) * K) + X) * M);

    double powInputValue = 0;
    if (result > 360) {
      powInputValue = X * Math.sin(result);
    } else {
      // inputValue = K * Math.sin(result); // <= Compiler error
    }

    result = Math.pow(result, powInputValue);
    if (result > 360) {
      result = result / inputValue;
    }

    return result;
  }
}

/* ########## End of File ########## */