Page History

public interface CallBack {
  void callMethod();
}
 
class CallBackImpl implements CallBack {
  public void callMethod() {
    System.out.println("CallBack invoked");
  }
}
 
class Client {CallBackAction
  CallBack callback;
  public void registerCallBackCallBackAction(CallBack callback) {
    this.callback = callback;
  }
 
  public void doSomethingperform() {
    callback.callMethod();
  }
}
class Client {
  public static void main(String[] args) {
    ClientCallBackAction clientaction = new Client();
    client.registerCallBack(CallBackAction(new CallBackImpl());
    // ...
    client.doSomethingperform(); // Prints "CallBack invoked"
  }
}