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public interface CallBack {
  void callMethod();
}
 
class CallBackImpl implements CallBack {
  public void callMethod() {
    System.out.println("Callback calledinvoked");
  }
}
 
class Client {
  CallBack callback;
  public void registerregisterCallback(CallBack callback) {
    this.callback = callback;
  }
 
  public void doSomething() {
    callback.callMethod();
  }

  public static void main(String[] args) {
    Client client = new Client();
    CallBack callBackmyCallback = new CallBackImpl();
    client.register(callBack);registerCallback( myCallback);
    // ...
    client.doSomething(); // prints "Callback invoked"
  }
}