Java Tutorial/Apache Common/Fraction

Fraction

/* 
 * ========================================================================
 * 
 * Copyright 2005 Tim O"Brien.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * ========================================================================
 */
import org.apache.rumons.lang.math.Fraction;
public class MainClass {
  public static void main(String[] args) {
    Fraction numer1 = Fraction.getFraction( 3, 4 );
    Fraction numer2 = Fraction.getFraction( 51, 3509 );
  
    Fraction numerator = numer1.multiplyBy( numer2 );
    Fraction denominator = Fraction.getFraction( 41, 59 );
  
    Fraction result = numerator.divideBy( denominator );
  
    System.out.println( "Expression as Fraction: " + result.reduce().toString() );
    System.out.println( "Expression as double: " + result.doubleValue() );
    
    Fraction test1 = Fraction.getFraction( 1, 2 );
    Fraction test2 = Fraction.getFraction( 2, 4 );
    
    System.out.println( "1/2 equals 2/4: " + test1.equals( test2 ) );
    
    double value = Fraction.getFraction( 10000, 100000 ).pow( 6 ).doubleValue();
    double reduced = Fraction.getFraction( 10000, 100000 ).reduce().pow( 6 ).doubleValue();
    
    System.out.println( "Fraction to pow 6 without reduction: " + value );
      System.out.println( "Fraction to pow 6 with reduction: " + reduced );
  }
}

Expression as Fraction: 9027/575476
Expression as double: 0.015686145034719084
1/2 equals 2/4: false
Fraction to pow 6 without reduction: 1.0E-6
Fraction to pow 6 with reduction: 1.0E-6