Extract randomChoice method

Author: JavierGelatti

HTW/src/htw/game/HuntTheWumpusGame.java

@@ -58,7 +58,6 @@ private List<Connection> connectionsOf(String cavern) {
         .collect(Collectors.toList());
   }
 
-
   public void addBatCavern(String cavern) {
     batCaverns.add(cavern);
   }
@@ -85,19 +84,23 @@ protected void moveWumpus() {
     wumpusChoices.add(wumpusCavern);
 
     int nChoices = wumpusChoices.size();
-    int choice = (int) (Math.random() * nChoices);
+    int choice = randomChoice(nChoices);
     wumpusCavern = wumpusChoices.get(choice);
   }
 
   private void randomlyTransportPlayer() {
     Set<String> transportChoices = new HashSet<>(caverns);
     transportChoices.remove(playerCavern);
     int nChoices = transportChoices.size();
-    int choice = (int) (Math.random() * nChoices);
+    int choice = randomChoice(nChoices);
     String[] choices = new String[nChoices];
     playerCavern = transportChoices.toArray(choices)[choice];
   }
 
+  private int randomChoice(int numberOfPossibleChoices) {
+    return (int) (Math.random() * numberOfPossibleChoices);
+  }
+
   public void setQuiver(int arrows) {
     this.quiver = arrows;
   }