japod@25: 
japod@25: package org.apidesign.apifest08.currency;
japod@25: 
japod@25: public final class Rate {
japod@25: 
japod@25:     private double rate;
japod@25: 
japod@25:     public Rate(int amountA, int amountB) {
japod@25:         rate = amountA / (double)amountB;
japod@25:         if (rate <= 0) {
japod@25:             throw new IllegalArgumentException("Exchange rate must be positive.");
japod@25:         }
japod@25:     }
japod@25: 
japod@25:     public Rate(double amountA, double amountB) {
japod@25:         rate = amountA / amountB;
japod@25:         if (rate <= 0) {
japod@25:             throw new IllegalArgumentException("Exchange rate must be positive.");
japod@25:         }
japod@25:     }
japod@25:     
japod@25:     public Rate(double rate) {
japod@25:         this.rate = rate;
japod@25:         if (this.rate <= 0) {
japod@25:             throw new IllegalArgumentException("Exchange rate must be positive.");
japod@25:         }
japod@25:     }
japod@25: 
japod@25:     public double convertAtoB(int a) {
japod@25:         return a / rate;
japod@25:     }
japod@25: 
japod@25:     public double convertAtoB(double a) {
japod@25:         return a / rate;
japod@25:     }
japod@25: 
japod@25:     public double convertBtoA(int b) {
japod@25:         return b * rate;
japod@25:     }
japod@25: 
japod@25:     public double convertBtoA(double b) {
japod@25:         return b * rate;
japod@25:     }
japod@25: 
japod@25: 
japod@25:     @Override
japod@25:     public boolean equals(Object obj) {
japod@25:         if (obj == null) {
japod@25:             return false;
japod@25:         }
japod@25:         if (getClass() != obj.getClass()) {
japod@25:             return false;
japod@25:         }
japod@25:         final Rate other = (Rate) obj;
japod@25:         return true;
japod@25:     }
japod@25: 
japod@25:     @Override
japod@25:     public int hashCode() {
japod@25:         int hash = 5;
japod@25:         return hash;
japod@25:     }
japod@25: 
japod@25:     @Override
japod@25:     public String toString() {
japod@25:         return ""+rate;
japod@25:     }
japod@25: }