basic Code reading in android

This is a part of android app project, i have got this code I am not able to understand that setOnItemClickListener takes (AdapterView.OnItemClickListener listener) as paramter but the other method void onItemClick is also in paramter space . I am not able to understand that how the object of AdapterView.OnItemClickListener() is calling/using onItemClick ? listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
            String forecast = mForecastAdapter.getItem(position);
            Intent intent = new Intent(getActivity(), MainActivity2Activity.class)
                    .putExtra(Intent.EXTRA_TEXT, forecast);
            startActivity(intent);
        }
    })