Can I use implements and extends at the same time?

Question

Can i use the implements and the extends at the same time? Because I need to inherit something on the other class while i used implements on the same class.

public class DetailActivity extends AppCompatActivity
implementsView.OnClickListener "extends ListActivity" 

How can it be like that?

Answer 1

Yes, you can. But you need to declare extends before implements:

public class DetailActivity extends AppCompatActivity implements Interface1, Interface2 {
 // ...
}

Any number of interfaces can be implemented, if more than one then each needs to be separated with a comma.

Answer 2

You can only extend one class but you implements multiple interfaces as your need.