destroy for AI Player

src/AiPlayer.java

@@ -35,6 +35,7 @@ public abstract class AiPlayer extends LocalPlayer implements Runnable {
     }
 
     public void aiShoot() {
+        if (!this.myTurn) return;
         this.enemy.receiveShoot(RandomPoint());
         return;
     }
@@ -93,4 +94,20 @@ public abstract class AiPlayer extends LocalPlayer implements Runnable {
            
         this.aiShoot();
     }
+
+    @Override
+    public void destroy() {
+        super.destroy();
+        Iterator<Thread> i = this.shootThreads.iterator();
+        while(i.hasNext()) {
+            Thread thread = i.next();
+            try {
+                thread.join();
+                i.remove();
+            } catch (InterruptedException e) {
+                // TODO Auto-generated catch block
+                e.printStackTrace();
+            }
+        }
+    }
 }