Question

For my Java game server I send the Action ID of the packet which basically tells the server what the packet is for. I want to map each Action ID (an integer) to a function. Is there a way of doing this without using a switch?

Answer 1

What about this one?

HashMap<Integer, Runnable> map = new HashMap<Integer, Runnable>(); map.put(Register.ID, new Runnable() {      public void run() { functionA(); } }); map.put(NotifyMessage.ID, new Runnable() {      public void run() { functionB(); } }); // ... map.get(id).run(); 

(If you need to pass some arguments, define your own interface with a function having a suitable parameter, and use that instead of Runnable).