How reverse data in model class

Question

I use firebase ui realtime database to fetch data in RecyclerView and i use

model class and i need to show the latest item firest i try to use

Collections.reverse(list) but i dont know where this list or where i use

MainActivity.java

package com.ahmed612.muslimStatu;

import ...

public class MainActivity extends AppCompatActivity {
...

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

    viewPager2 = (ViewPager2) findViewById(R.id.vpager);

    FirebaseRecyclerOptions<videomodel> options = new FirebaseRecyclerOptions.Builder<videomodel>()
            .setQuery(FirebaseDatabase.getInstance().getReference().child("videos"), videomodel.class).build();

    adapter = new videoadapter(options);
    viewPager2.setAdapter(adapter);
    
    

    
}

@Override
protected void onStart() {
    super.onStart();
    adapter.startListening();
}

}

videomodel.java

package com.ahmed612.muslimStatu;

public class videomodel
{
String desc,title,url;

public videomodel(String desc, String title, String url) {
    this.desc = desc;
    this.title = title;
    this.url = url;
}
videomodel()
{

}

public String getDesc() {
    return desc;
}

public void setDesc(String desc) {
    this.desc = desc;
}

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public String getUrl() {
    return url;
}

public void setUrl(String url) {
    this.url = url;
}
}

What i do to show the latest item is the first?