fixing 3 bugs in torpedostore

src/main/java/hu/bme/mit/spaceship/TorpedoStore.java

@@ -9,6 +9,9 @@
 */
 public class TorpedoStore {
 
+  //random letrhozasa
+  Random generator = new Random();
+
   // rate of failing to fire torpedos [0.0, 1.0]
   private double FAILURE_RATE = 0.0; //NOSONAR
 
@@ -30,18 +33,18 @@ public TorpedoStore(int numberOfTorpedos){
 
   public boolean fire(int numberOfTorpedos){
     if(numberOfTorpedos < 1 || numberOfTorpedos > this.torpedoCount){
-      new IllegalArgumentException("numberOfTorpedos");
+      throw new IllegalArgumentException("numberOfTorpedos");
     }
 
     boolean success = false;
 
     // simulate random overheating of the launcher bay which prevents firing
-    Random generator = new Random();
+
     double r = generator.nextDouble();
 
     if (r >= FAILURE_RATE) {
       // successful firing
-      this.torpedoCount =- numberOfTorpedos;
+      this.torpedoCount = -numberOfTorpedos;
       success = true;
     } else {
       // simulated failure