Java how to handle “Unchecked cast” for Array from Object

Question

In my Android project I have made an abstract AsyncTask class in which I input the URL and if needed paging information so I don\'t need to keep writing the HTTP stuff etc.<

Answer 1

You cannot do it without a warning. You are casting an Object to some other class, and even if the Object is an instance of ArrayList you don't know it's generic type.

Update:

if you wrote SuperCoolAsyncTask yourself, you could parametrize the class with generics:

public abstract class SuperCoolAsyncTask {

    protected abstract void onAsyncTaskResult(ResultType o);

}

And then, when you invoke your code:

new SuperCoolAsyncTask>() {
    @Override
    protected void onAsyncTaskResult(ArrayList o) {
            AppConstants.scoreStatistics = o;
    }
}.execute(get_url_score_statistics());