Summierung von Beträgen unterschiedlicher Währungen verbieten

axelerator · Jun 28, 2015 · 8854ebb · 8854ebb
1 parent 70ef544
commit 8854ebb
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Showing 2 changed files with 9 additions and 4 deletions.
diff --git a/DerPreisIstHeiss.java b/DerPreisIstHeiss.java
@@ -25,6 +25,9 @@ public boolean equals(Object other) {
     }
 
     public Price sum(Price other) {
+      if (other.currency != this.currency) {
+        throw new RuntimeException("Währungen sind nicht gleich");
+      }
       return new Price(this.amount + other.amount, this.currency);
     }
   }
@@ -37,7 +40,6 @@ public static void main(String[] args) {
 
     Price deuro = oneEuro.sum(oneDollar);
 
-    System.out.println(oneEuro + " equals " + oneDollar + ": " + oneEuro.equals(oneDollar));
     System.out.println(oneEuro + " + " + oneDollar + "= " + deuro);
 
   }

diff --git a/README.md b/README.md
@@ -26,6 +26,9 @@ class DerPreisIstHeiss {
     }
 
     public Price sum(Price other) {
+      if (other.currency != this.currency) {
+        throw new RuntimeException("Währungen sind nicht gleich");
+      }
       return new Price(this.amount + other.amount, this.currency);
     }
   }
@@ -38,7 +41,6 @@ class DerPreisIstHeiss {
 
     Price deuro = oneEuro.sum(oneDollar);
 
-    System.out.println(oneEuro + " equals " + oneDollar + ": " + oneEuro.equals(oneDollar));
     System.out.println(oneEuro + " + " + oneDollar + "= " + deuro);
 
   }
@@ -47,6 +49,7 @@ class DerPreisIstHeiss {
 Ausgabe:
 ========
 ```
-1.00 € equals 1.00 $: false
-1.00 € + 1.00 $= 2.00 €
+Exception in thread "main" java.lang.RuntimeException: Währungen sind nicht gleich
+	at DerPreisIstHeiss$Price.sum(DerPreisIstHeiss.java:29)
+	at DerPreisIstHeiss.main(DerPreisIstHeiss.java:41)
 ```