How to replace the listeners with anonymous classes in Java?
Solution 1:
You can anonymously implement the interface by opening a block after the new call:
listeners.add(new ClientRegistrationListener() {
@Override
public void onClientAdded(Client client) {
System.out.println("Client added: " + client.getName());
}
});
Or, even more elegantly, since ClientRegistrationListener is a functional interface (even though it's not annotated as one), you can anonymously implement it with a lambda expression:
listeners.add(client -> System.out.println("Client added: " + client.getName()));