how to add interface and enum in this code. about java

[ASHUTOSH2224]

import com.apptracker.android.listener.AppModuleListener;
import com.apptracker.android.track.AppTracker;

// Interface for AdType
public interface AdType {
String getLocation();
}

// Enum for Ad Locations
public enum AdLocation implements AdType {
INTERSTITIAL("inapp"),
VIDEO("video");

private final String location;

AdLocation(String location) {
this.location = location;
}

@OverRide
public String getLocation() {
return location;
}
}

// Leadbolt SDK integration
public class MainActivity extends Activity {

private final AppModuleListener leadboltListener = new AppModuleListener() {
// Implement methods for handling ad events (as before)
};

@OverRide
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

if (savedInstanceState == null) {
  AppTracker.setModuleListener(leadboltListener);
  AppTracker.startSession(getApplicationContext(), "YOUR_APP_API_KEY", AppTracker.ENABLE_AUTO_CACHE);

  // Cache Leadbolt ad based on AdType
  cacheAd(AdLocation.INTERSTITIAL);
}

}

public void gameOver() {
if (AppTracker.isAdReady(getSelectedAd().getLocation())) {
AppTracker.loadModule(getApplicationContext(), getSelectedAd().getLocation());
}
}

private AdType getSelectedAd() {
// Choose the appropriate AdType based on your logic (e.g., return AdLocation.VIDEO)
return AdLocation.INTERSTITIAL;
}

private void cacheAd(AdType adType) {
AppTracker.loadModuleToCache(getApplicationContext(), adType.getLocation());
}
}